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ABGC Certification Examination (CGC credential) practice questions

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Question 1Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A couple of Ashkenazi Jewish ancestry is seen for preconception counseling. Both partners are unaffected, but each has a sibling with Tay-Sachs disease. What is the most appropriate first step in assessing their reproductive risk?

  1. Recommend prenatal diagnosis by chorionic villus sampling in the next pregnancy without parental testing
  2. Perform whole-genome sequencing only on the affected siblings
  3. Reassure them that their risk equals the general population because neither is affected
  4. Order carrier testing for hexosaminidase A enzyme activity and HEXA common variants in both partners Correct answer.

Explanation

Having an affected sibling makes each partner an obligate carrier at a 2/3 prior probability, so carrier testing should be offered to both partners to determine whether they are a carrier couple. If both are confirmed carriers, each pregnancy carries a 25% risk and prenatal or preimplantation options can be discussed.

Question 2Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A 28-year-old woman with a strong family history of early-onset breast cancer asks about genetic testing. Which feature of the pedigree most strongly supports offering BRCA1/BRCA2 testing?

  1. Her mother diagnosed with breast cancer at age 41 and a maternal aunt with ovarian cancer at 52 Correct answer.
  2. Her grandmother diagnosed with breast cancer at age 70
  3. A single paternal aunt diagnosed with breast cancer at age 62
  4. Two cousins with breast cancer, both diagnosed after age 65

Explanation

The combination of young-onset breast cancer and ovarian cancer in close relatives on the same side is a classic pattern suggesting a hereditary breast and ovarian cancer syndrome. Testing is most informative when an affected relative is tested first or when the personal history meets testing criteria.

Question 3Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

During a session, a client says, 'I just want to know if my baby will be normal.' Which response best reflects the genetic counselor's role?

  1. Reassure the client that most babies are healthy and move on to the next topic
  2. Explore what the client means by 'normal' and clarify what testing can and cannot tell them Correct answer.
  3. Explain that 'normal' is not a medical term and decline to discuss the question
  4. Recommend the most comprehensive test available to maximize information

Explanation

Genetic counseling uses a client-centered approach that clarifies the client's concerns and expectations before presenting options. Exploring the meaning of 'normal' helps identify specific worries and allows accurate discussion of the limits of prenatal testing.

Question 4Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

Which statement best describes the principle of informed consent in genetic testing?

  1. Consent can be obtained by the laboratory after testing is complete
  2. Consent is only required for research testing, not clinical testing
  3. Consent is implied once a blood sample is drawn
  4. Consent requires disclosure of purpose, risks, benefits, and alternatives, and is voluntary Correct answer.

Explanation

Informed consent in genetic testing requires that the individual understand the purpose of testing, potential results and limitations, risks, benefits, and alternatives, and that the decision be voluntary. It should be obtained before testing and documented.

Question 5Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A couple's newborn is diagnosed with cystic fibrosis. Both parents are carriers of a CFTR variant. What is the recurrence risk for each future pregnancy?

  1. 1 in 4 (25%) Correct answer.
  2. 2 in 3 (67%)
  3. 1 in 8 (12.5%)
  4. 1 in 2 (50%)

Explanation

Cystic fibrosis is inherited in an autosomal recessive pattern. When both parents are confirmed carriers, each pregnancy has a 25% chance of an affected child, a 50% chance of a carrier child, and a 25% chance of an unaffected non-carrier child.

Question 6Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A woman with a known pathogenic BRCA1 variant undergoes predictive testing, and the result is negative. Which interpretation is most accurate?

  1. She is a carrier of a different BRCA1 variant not detected by the test
  2. She has no increased cancer risk and requires no further screening
  3. The result is uninformative because she is unaffected
  4. She did not inherit the familial BRCA1 variant, and her risk reverts toward population risk Correct answer.

Explanation

When a pathogenic variant has already been identified in the family, a negative predictive test means the individual did not inherit that variant. Her risk is generally reduced to the population level, though standard screening guidelines still apply.

Question 7Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

Which of the following best defines a variant of uncertain significance (VUS) in a cancer predisposition gene?

  1. A variant with insufficient evidence to classify as benign or pathogenic Correct answer.
  2. A benign polymorphism with no clinical relevance
  3. A variant that is clearly pathogenic and warrants altered management
  4. A variant that is always reclassified as pathogenic within a year

Explanation

A VUS is a variant for which available evidence is insufficient to determine whether it causes disease. Management should generally follow family history rather than the VUS result, and reclassification may occur as evidence accumulates.

Question 8Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A 45-year-old man has a personal history of colorectal cancer and multiple adenomatous polyps. Which genetic counseling action is most appropriate?

  1. Reassure him that his cancer is sporadic given his age
  2. Recommend average-risk colonoscopy intervals for his children
  3. Advise his children to begin screening at age 50
  4. Discuss testing for Lynch syndrome and polyposis syndromes and refer for genetic evaluation Correct answer.

Explanation

Multiple adenomatous polyps and early-onset colorectal cancer raise suspicion for a hereditary colorectal cancer syndrome. Genetic evaluation helps identify the syndrome and guides screening for at-risk relatives.

Question 9Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client with a family history of Huntington disease asks about predictive testing. Which counseling point is most important before testing?

  1. Testing guarantees insurance coverage for future care
  2. Predictive testing is not available for adult-onset conditions
  3. A positive result confirms age of onset
  4. The result can reveal information about relatives who have not chosen testing Correct answer.

Explanation

Predictive testing for Huntington disease can reveal the genetic status of relatives, raising privacy and autonomy concerns. Pretest counseling should address these implications, along with the lack of prevention and the psychological impact of results.

Question 10Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A couple has a child with an autosomal recessive condition. Both parents' carrier testing is negative for the identified variants. What is the most likely explanation?

  1. One parent may carry a variant not detected by the testing method used, such as a deletion Correct answer.
  2. The condition must be autosomal dominant
  3. Recurrence risk is zero for future pregnancies
  4. The child's diagnosis is incorrect and should be disregarded

Explanation

Standard carrier testing may miss certain variant types, such as large deletions or deep intronic changes. When a child is affected but parental testing is negative, further evaluation such as deletion/duplication analysis or sequencing may be warranted.

Question 11Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A woman with a strong family history of BRCA-related cancer tests negative for a known familial BRCA2 variant. Which statement best describes the clinical implications?

  1. She should be retested every year indefinitely
  2. The result is a VUS and should not guide management
  3. Her risk is now equal to the general population and no additional screening is needed
  4. She should be screened as high risk because her family history is unchanged Correct answer.

Explanation

A true negative predictive test reduces the risk of the familial variant, but family history may still confer some increased risk. Many guidelines recommend that management be based on family history when it remains significant.

Question 12Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

In a family with an autosomal dominant condition, a 30-year-old at-risk woman has not been tested. What is the most appropriate counseling approach regarding her siblings?

  1. Tell her siblings are not at risk unless she is affected
  2. Require her to disclose her status before further counseling
  3. Inform her siblings directly without her consent
  4. Discuss that she may share information with relatives and support her in doing so Correct answer.

Explanation

Genetic counselors respect client confidentiality while encouraging voluntary disclosure to at-risk relatives. Direct contact generally requires the client's permission, and support can be offered through letters or family discussions.

Question 13Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A couple of Mediterranean ancestry has a child with beta-thalassemia major. Which testing strategy best identifies their carrier status?

  1. Hemoglobin electrophoresis alone in both parents
  2. Newborn screening review only
  3. HBB gene sequencing with reflex deletion/duplication analysis in both parents Correct answer.
  4. Karyotype analysis of both parents

Explanation

Beta-thalassemia is caused by HBB variants, and carrier status is best confirmed by molecular testing of the HBB gene, including deletion/duplication analysis for variants missed by sequencing. This allows accurate recurrence risk counseling and prenatal options.

Question 14Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client requests testing for a condition for which no effective treatment exists and expresses anxiety about the result. Which counseling approach is most appropriate?

  1. Explore motivations, expected outcomes, and coping resources before testing Correct answer.
  2. Refer only to a psychiatrist without discussing genetic testing
  3. Decline testing because no treatment exists
  4. Recommend immediate testing to reduce anxiety

Explanation

Pretest counseling for untreatable conditions should explore the client's motivations, expectations, and support systems. This supports autonomous decision-making and prepares the client for possible results.

Question 15Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A 35-year-old pregnant woman requests cell-free DNA screening. Which statement best describes its limitations?

  1. It detects all chromosomal abnormalities with equal accuracy
  2. It is a diagnostic test that replaces amniocentesis
  3. It is a screening test and positive results require diagnostic confirmation Correct answer.
  4. It is not affected by fetal fraction

Explanation

Cell-free DNA screening estimates the chance of certain chromosomal conditions but is not diagnostic. Positive results should be confirmed with diagnostic testing such as amniocentesis or chorionic villus sampling.

Question 16Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A family presents with a condition that affects only males and is transmitted through unaffected females. Which inheritance pattern is most consistent?

  1. Mitochondrial
  2. Autosomal dominant
  3. Autosomal recessive
  4. X-linked recessive Correct answer.

Explanation

Male-only affected individuals with transmission through unaffected carrier females is characteristic of X-linked recessive inheritance. Affected males inherit the variant from their carrier mothers, and daughters may be carriers.

Question 17Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client with a family history of a pathogenic variant in a cancer predisposition gene asks about testing her minor child. What is the most appropriate response?

  1. Refer the child for immediate prophylactic surgery
  2. Test the child now because the parent requests it
  3. Explain that predictive testing for adult-onset conditions is generally deferred until adulthood Correct answer.
  4. Recommend testing only if the child has symptoms

Explanation

Predictive testing of minors for adult-onset conditions is generally discouraged when no medical benefit exists during childhood. Testing is typically deferred until the individual can make an informed decision.

Question 18Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A woman with a strong family history of ovarian cancer is found to carry a pathogenic RAD51C variant. Which statement best reflects current understanding?

  1. RAD51C variants are benign polymorphisms
  2. RAD51C variants are unrelated to cancer risk
  3. RAD51C variants only increase risk in males
  4. RAD51C variants are associated with increased ovarian cancer risk and may warrant risk-reducing surgery Correct answer.

Explanation

Pathogenic variants in RAD51C are associated with increased risk of ovarian cancer and are included in hereditary breast and ovarian cancer testing panels. Management may include risk-reducing salpingo-oophorectomy after discussion of risks and benefits.

Question 19Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A patient is found to have a pathogenic variant in a gene associated with Lynch syndrome. Which screening recommendation is most appropriate?

  1. Colonoscopy every 10 years starting at age 50
  2. Colonoscopy every 1 to 2 years starting at age 20 to 25 Correct answer.
  3. No additional screening is needed
  4. Mammography every year starting at age 30

Explanation

Lynch syndrome carries a high risk of early-onset colorectal cancer, so guidelines recommend frequent colonoscopy starting in early adulthood. Screening intervals are shorter than for average-risk individuals.

Question 20Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client's genetic test result is a VUS in a gene associated with an autosomal dominant condition. Which management approach is most appropriate?

  1. Treat the client as affected and initiate intensive surveillance
  2. Inform the client that the result is definitely pathogenic
  3. Manage based on personal and family history and consider reclassification over time Correct answer.
  4. Recommend testing all relatives immediately

Explanation

A VUS should not be used to alter medical management because its clinical significance is unknown. Care should be guided by personal and family history, and the variant may be reclassified as evidence evolves.

Question 21Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A couple is considering preimplantation genetic testing for a monogenic condition (PGT-M). Which statement best describes the process?

  1. PGT-M guarantees a healthy child
  2. PGT-M is only available for chromosomal abnormalities
  3. Embryos are tested after implantation
  4. Embryos are tested before transfer, and unaffected embryos may be selected Correct answer.

Explanation

PGT-M involves testing embryos created through in vitro fertilization before transfer. Embryos without the familial variant may be selected for transfer, though PGT-M does not guarantee a healthy child.

Question 22Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client with a known pathogenic variant in a highly penetrant gene asks about life insurance before testing. Which counseling point is most accurate?

  1. Testing results are never shared with insurers
  2. Genetic information cannot affect insurance in any circumstance
  3. Some jurisdictions have genetic nondiscrimination protections, but life insurance may not be covered Correct answer.
  4. Life insurance companies are prohibited from using any medical information

Explanation

Genetic nondiscrimination laws vary by jurisdiction and often focus on health insurance and employment. Life, disability, and long-term care insurance may not be protected, so clients should be informed before testing.

Question 23Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A family presents with a condition that affects multiple generations, affects both sexes, and shows male-to-male transmission. Which inheritance pattern is most consistent?

  1. Autosomal dominant Correct answer.
  2. X-linked recessive
  3. X-linked dominant
  4. Mitochondrial

Explanation

Male-to-male transmission excludes X-linked inheritance because fathers pass their Y chromosome to sons. Multiple affected generations in both sexes are consistent with autosomal dominant inheritance.

Question 24Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client carries a pathogenic variant in a gene with reduced penetrance. Which statement best describes the counseling implication?

  1. Carriers have an increased but not certain risk of developing the condition Correct answer.
  2. The variant should be reclassified as benign
  3. All carriers will develop the condition
  4. Penetrance does not affect counseling

Explanation

Reduced penetrance means that not all individuals with a pathogenic variant will develop the condition. Counseling should convey an increased but uncertain risk and discuss surveillance and risk-reducing options.

Question 25Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A couple's child has a clinical diagnosis of a condition, but exome sequencing identifies a VUS in a candidate gene. Which next step is most appropriate?

  1. Discontinue all clinical follow-up
  2. Pursue segregation studies and functional or RNA evidence to clarify the variant Correct answer.
  3. Inform the family that no genetic cause exists
  4. Treat the VUS as diagnostic and begin surveillance

Explanation

When a VUS is identified in a candidate gene, additional evidence such as segregation in family members, functional studies, or RNA analysis may support reclassification. This process helps determine whether the variant explains the phenotype.

Question 26Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A genetic counselor obtains informed consent before a germline sequencing test. Which element is most essential to include in that consent discussion?

  1. The names of the bioinformaticians who will analyze the sample
  2. The laboratory's internal quality control thresholds for sequencing depth
  3. The exact turn-around time in business days for each sequencing instrument
  4. The possibility of incidental or secondary findings and the option to opt in or out Correct answer.

Explanation

Informed consent for genomic testing must disclose that variants unrelated to the primary indication may be found and that patients can usually choose whether to receive them. This respects autonomy and prepares the client for unexpected information. Logistics such as instrument schedules or staff names are not core consent elements.

Question 27Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

During a session, a client says she feels guilty that she may have passed a condition to her child. Which counseling response best reflects the principle of non-directiveness?

  1. Reassure her that guilt is irrational and she should stop focusing on it
  2. Explore her feelings without advising her what decision to make about future reproduction Correct answer.
  3. Recommend that she avoid further pregnancies to prevent recurrence
  4. Tell her that most parents in her situation choose prenatal testing

Explanation

Non-directiveness means supporting clients in reaching their own decisions rather than steering them toward a particular choice. Exploring feelings and providing information preserves client autonomy. Advising a specific reproductive path or citing what others do imposes the counselor's values.

Question 28Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client's test report lists a variant classified as likely pathogenic. Under a standard five-tier classification system, what does this designation most accurately indicate?

  1. The variant is proven to cause disease in every carrier
  2. The variant is a normal polymorphism common in the population
  3. The variant is probably disease-causing but falls short of the criteria for pathogenic Correct answer.
  4. The variant has no clinical significance and can be ignored

Explanation

The five-tier system ranks variants as pathogenic, likely pathogenic, uncertain significance, likely benign, and benign. Likely pathogenic means the evidence strongly favors pathogenicity but does not meet the full pathogenic threshold. It is not equivalent to certain causation or to benign status.

Question 29Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A couple asks how their risk changes if both partners are confirmed carriers of the same autosomal recessive condition. What recurrence risk should the counselor quote for each pregnancy?

  1. 25% Correct answer.
  2. 50%
  3. 100%
  4. 75%

Explanation

When both parents are carriers of the same autosomal recessive variant, each pregnancy carries a 25% chance of an affected child, a 50% chance of a carrier child, and a 25% chance of an unaffected non-carrier child. The risk is independent for each pregnancy.

Question 30Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client's mother died of a condition consistent with an autosomal dominant cancer syndrome, but the client has no living affected relative available for testing. Which testing approach is most appropriate?

  1. Test the client for a broad multigene panel because no familial variant is known Correct answer.
  2. Decline all testing until an affected relative is located
  3. Test only for variants reported in population databases
  4. Assume the client is affected based on family history alone

Explanation

When no affected relative is available to establish the familial variant, testing the unaffected at-risk client with a multigene panel is a reasonable strategy. A negative result is less informative than targeted testing, but testing can still identify a causative variant. Assuming affected status or refusing testing denies the client useful information.

Question 31Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client of Ashkenazi Jewish ancestry is considering carrier screening. Which panel design best reflects current practice for this population?

  1. Testing only the male partner regardless of the female partner's results
  2. Screening only after an affected child is born
  3. A pan-ethnic expanded carrier panel that includes conditions with elevated frequency in this population Correct answer.
  4. Screening only for cystic fibrosis because it is the most common condition

Explanation

Expanded carrier screening panels include conditions such as Tay-Sachs, Canavan, and Gaucher disease that occur at elevated frequency in Ashkenazi Jewish populations, alongside many other conditions. Pan-ethnic panels are now widely used rather than ancestry-limited testing. Screening only after an affected birth forgoes reproductive options.

Question 32Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A 28-year-old woman with no personal history of cancer but a mother and maternal aunt with early-onset breast cancer asks about genetic testing. What is the most appropriate initial step?

  1. Order a full genome sequence immediately
  2. Recommend risk-reducing mastectomy before any testing
  3. Reassure her that family history is irrelevant without personal disease
  4. Construct a detailed three-generation pedigree and assess testing eligibility Correct answer.

Explanation

A detailed pedigree documenting cancer types, ages at diagnosis, and lineage is the foundation for assessing whether genetic testing criteria are met and which genes to test. Testing decisions follow from that assessment. Surgery or whole-genome sequencing without indication is premature.

Question 33Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client is found to carry a pathogenic variant in a gene associated with a hereditary cancer syndrome. Which statement best describes the counseling implication for his adult siblings?

  1. Siblings are automatically affected with the associated cancer
  2. Siblings should all be tested without being informed of the finding
  3. Siblings have no increased risk because the variant arose only in the client
  4. Each sibling has a 50% chance of inheriting the variant if a parent carried it Correct answer.

Explanation

For an autosomal dominant predisposition, each first-degree relative of a carrier has a 50% chance of carrying the same variant. Sharing this information allows siblings to pursue predictive testing and risk management. Carrying a variant increases risk but does not mean the cancer is present.

Question 34Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client with limited English proficiency is preparing for a genetic counseling session about a serious diagnosis. Which approach best supports informed decision-making?

  1. Arrange a qualified medical interpreter and provide translated written materials Correct answer.
  2. Speak more loudly and use technical terms repeatedly
  3. Postpone all counseling until the client learns English
  4. Use the client's young child to interpret sensitive information

Explanation

Professional interpretation and translated materials ensure that the client understands complex genetic information and can give informed consent. Using family members, especially children, compromises confidentiality and accuracy. Postponing care indefinitely is not acceptable.

Question 35Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client asks whether direct-to-consumer genetic testing results can be used to confirm a clinical diagnosis. Which response is most accurate?

  1. Direct-to-consumer results are equivalent to clinical diagnostic testing
  2. Direct-to-consumer results may require confirmation in a clinical laboratory before clinical use Correct answer.
  3. Direct-to-consumer results should always be used to guide medical management without confirmation
  4. Direct-to-consumer tests cannot detect any genetic variants

Explanation

Direct-to-consumer tests vary in analytic validity and often use different methods and standards than clinical laboratories. Clinically actionable findings should be confirmed by a certified clinical laboratory before influencing medical decisions. They are not equivalent to diagnostic testing, though they can detect variants.

Question 36Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client with a family history of a serious adult-onset neurodegenerative condition asks about testing. Which ethical principle most directly supports the counselor's obligation to protect the client's genetic information from disclosure to relatives without consent?

  1. Justice
  2. Beneficence
  3. Confidentiality Correct answer.
  4. Veracity

Explanation

Confidentiality obligates the counselor to protect the client's genetic information from unauthorized disclosure, including to relatives. Beneficence concerns promoting welfare, justice concerns fairness in access, and veracity concerns truthfulness. Genetic information is treated as sensitive personal data.

Question 37Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A couple whose child has a suspected metabolic disorder is considering exome sequencing after inconclusive biochemical testing. Which statement best describes the expected diagnostic yield and limitations?

  1. Exome sequencing will always identify a causative variant
  2. Exome sequencing can identify a causative variant in a substantial minority of cases but may return uncertain or negative results Correct answer.
  3. Exome sequencing cannot detect any sequence variants
  4. Exome sequencing is useful only for chromosomal aneuploidy

Explanation

Exome sequencing has meaningful diagnostic yield in suspected Mendelian disease but frequently returns variants of uncertain significance or no explanation. It does not guarantee a diagnosis and covers coding regions rather than all variation. Aneuploidy is better assessed by chromosomal testing.

Question 38Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client's newborn screening result is positive for a condition, and confirmatory testing is pending. What is the most appropriate counseling message?

  1. The screen indicates increased risk and confirmatory diagnostic testing is needed before conclusions Correct answer.
  2. The child definitely has the condition and treatment should begin immediately without confirmation
  3. The result is meaningless and can be disregarded
  4. The result proves the child is a carrier only

Explanation

Newborn screening is designed to flag infants at increased risk, and positive screens require confirmatory diagnostic testing. Counseling should communicate the need for confirmation without prematurely declaring a diagnosis. Screening results are not meaningless, nor do they establish carrier status.

Question 39Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client with a known pathogenic variant in a gene associated with a hereditary cardiac condition asks about risks to her children. Which statement is most accurate for an autosomal dominant condition?

  1. Each child has a 50% chance of inheriting the variant Correct answer.
  2. No child can inherit the variant if the other parent is unaffected
  3. All children will inherit the variant
  4. Each child has a 25% chance of inheriting the variant

Explanation

For an autosomal dominant variant carried by one parent, each child independently has a 50% chance of inheriting the variant. The other parent's unaffected status does not eliminate risk. Inheritance is not certain, and 25% applies to autosomal recessive carrier couples.

Question 40Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client is considering prenatal diagnostic testing after a screening test indicates increased risk. Which statement best distinguishes screening from diagnosis?

  1. Screening tests provide a risk estimate and diagnostic tests provide a definitive answer Correct answer.
  2. Diagnostic tests are less informative than screening tests
  3. Screening tests are always diagnostic and require no follow-up
  4. Screening tests detect only structural anomalies

Explanation

Screening estimates the probability of a condition, whereas diagnostic testing such as chorionic villus sampling or amniocentesis provides a definitive result. A screen-positive result therefore warrants discussion of diagnostic options. Screening is not diagnostic, and diagnostic testing is more definitive.

Question 41Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client asks about the purpose of a genetic counseling session before undergoing testing for a late-onset condition. Which description best characterizes the session's core functions?

  1. To deliver test results without discussion
  2. To collect payment for laboratory services
  3. To persuade the client to accept testing
  4. To provide information, assess risk, and support autonomous decision-making Correct answer.

Explanation

Genetic counseling integrates risk assessment, education about testing and its implications, and psychosocial support so that clients can make informed, autonomous choices. It is not a sales or persuasion function. Results disclosure is one part of a broader process.

Question 42Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client reports that a relative received a genetic test result from a laboratory using a different classification system. Which action best supports accurate interpretation?

  1. Accept the relative's classification without review
  2. Assume all variants of uncertain significance are pathogenic
  3. Discard the report because classifications never change
  4. Obtain the laboratory report and interpret the variant using current evidence and standardized criteria Correct answer.

Explanation

Variant classifications depend on the evidence available at the time and can change as data accumulate. Reviewing the actual laboratory report and applying current standardized criteria supports accurate interpretation. Assuming pathogenicity or discarding reports undermines care.

Question 43Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A family is found to have a pathogenic variant in a gene associated with an autosomal recessive condition. Only one parent is a carrier. What is the most likely explanation for the affected child?

  1. The result indicates laboratory error with certainty
  2. The condition must be autosomal dominant in this family
  3. A second variant may be present in the other parent's allele, such as a deletion not detected by the initial test Correct answer.
  4. The child must have inherited two copies from the carrier parent

Explanation

When only one carrier parent is identified in a child with an autosomal recessive condition, possibilities include a second variant missed by the initial method, such as a deletion or structural change, or uniparental disomy. Further testing of the other parent's allele is warranted. Certain attribution to laboratory error is premature.

Question 44Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client is concerned about discrimination based on genetic test results. In the United States, which statement best reflects the protections provided by the Genetic Information Nondiscrimination Act?

  1. It requires employers to provide genetic testing to all employees
  2. It prohibits health insurers and employers from using genetic information in coverage and employment decisions Correct answer.
  3. It applies only to research participants
  4. It prohibits all forms of insurance, including life and disability insurance, from using genetic information

Explanation

GINA restricts health insurers from using genetic information for eligibility or pricing and prohibits employers from using it in hiring and other employment decisions. It does not cover life, disability, or long-term care insurance. It is not limited to research participants.

Question 45Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client with a strong family history of a condition asks about the difference between a pathogenic variant and a risk factor. Which explanation is most accurate?

  1. A pathogenic variant is a change known to contribute to disease, whereas a risk factor increases susceptibility without being sufficient alone Correct answer.
  2. A pathogenic variant guarantees disease, whereas a risk factor never does
  3. Risk factors are always inherited in an autosomal dominant pattern
  4. Pathogenic variants and risk factors are identical concepts

Explanation

Pathogenic variants are changes with evidence of contributing to disease, while risk factors increase susceptibility but are not sufficient to cause disease on their own. Neither guarantees disease in all carriers. The concepts are related but distinct.

Question 46Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client receives a result showing a variant of uncertain significance in a gene linked to an autosomal dominant condition. Which counseling approach is most appropriate?

  1. Explain that the variant's significance is unknown and management should be based on family history and other evidence Correct answer.
  2. Recommend prophylactic surgery based on the variant
  3. Inform the client that the variant is definitely benign
  4. Advise the client to ignore all future reclassification notices

Explanation

A variant of uncertain significance lacks sufficient evidence to be classified as pathogenic or benign, so clinical management should rely on family history and other risk factors rather than the variant itself. Reclassification can occur over time, so follow-up is valuable. Surgery or declaring the variant benign is unjustified.

Question 47Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client's family includes individuals with a condition affecting both sexes in every generation, and an affected father has affected sons. Which inheritance pattern is most consistent with this history?

  1. Mitochondrial
  2. X-linked recessive
  3. Autosomal recessive
  4. Autosomal dominant Correct answer.

Explanation

Transmission through both sexes in every generation, including father-to-son transmission, is characteristic of autosomal dominant inheritance. X-linked recessive conditions do not pass from father to son. Mitochondrial conditions pass through mothers, and autosomal recessive conditions typically skip generations.

Question 48Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client asks why a genetic counselor might recommend testing an affected family member first when a hereditary condition is suspected. Which reason is most accurate?

  1. Testing affected relatives is required by law before any other testing
  2. Testing an affected relative can identify the familial variant, enabling more informative testing of at-risk relatives Correct answer.
  3. Testing affected relatives is cheaper but provides no interpretive advantage
  4. Testing affected relatives eliminates the need for counseling at-risk relatives

Explanation

Identifying the causative variant in an affected family member establishes the familial variant so that at-risk relatives can undergo targeted predictive testing with clearer interpretation. This is a strategic advantage, not a legal requirement. Counseling of at-risk relatives remains necessary.

Question 49Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client with a family history of a condition asks about the role of genetic counseling in supporting reproductive decisions. Which statement best describes the counselor's role?

  1. To discourage prenatal testing in all cases
  2. To decide on the client's behalf which option to pursue
  3. To recommend a single reproductive option as the best choice
  4. To present available options and support the client's own decision Correct answer.

Explanation

Genetic counselors present reproductive options such as prenatal testing, preimplantation testing, and adoption in a balanced way and support the client's autonomous choice. Recommending or discouraging a particular option is directive. The counselor does not make decisions for the client.

Question 50Genetic Counseling Practice (official content outline not retrieved; domain names unavailable from source)

A client is found to have a variant in a gene with reduced penetrance. Which statement best describes the counseling implication?

  1. Carrying the variant increases risk, but some carriers will never develop the condition Correct answer.
  2. Reduced penetrance means the variant has no effect on risk
  3. Reduced penetrance applies only to autosomal recessive conditions
  4. Carrying the variant means the client will certainly develop the condition

Explanation

Reduced penetrance means that not all individuals carrying a pathogenic variant will develop the associated condition, so the variant increases risk without guaranteeing disease. It still has an effect on risk. Penetrance is relevant across inheritance patterns.