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ABPM Occupational Medicine study materials
ABPM Occupational Medicine study resources

ABPM Occupational Medicine practice questions

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Question 1Core Preventive Medicine

Which measure best expresses the strength of association between a single occupational exposure and a health outcome in a cohort study?

  1. Standardized mortality ratio
  2. Prevalence ratio
  3. Population attributable fraction
  4. Relative risk Correct answer.

Explanation

In a cohort study, incidence in exposed versus unexposed groups yields relative risk, the ratio of attack rates. The other measures answer different questions such as burden or cross-sectional comparison.

Question 2Core Preventive Medicine

A screening test used in a workplace has high sensitivity but low specificity. What is the main consequence when applied to a low-prevalence condition?

  1. A reduced positive predictive value only if prevalence rises
  2. Systematic underestimation of true prevalence
  3. A large number of false negatives
  4. A large number of false positives Correct answer.

Explanation

Low specificity means many people without disease test positive, and in low-prevalence settings these false positives dominate the positive results. Sensitivity governs false negatives, not false positives.

Question 3Core Preventive Medicine

In occupational epidemiology, the healthy worker effect most often produces which bias?

  1. Recall bias among retired workers
  2. Selection bias that underestimates mortality in employed cohorts Correct answer.
  3. Information bias from inaccurate exposure records
  4. Confounding by socioeconomic status in case-control designs

Explanation

Employed populations are on average healthier than the general population, so comparisons with general-population rates underestimate risk. This is a form of selection bias.

Question 4Core Preventive Medicine

Which prevention strategy is an example of primary prevention in occupational medicine?

  1. Hearing aid fitting for workers with impairment
  2. Engineering controls that reduce workplace noise below the action level Correct answer.
  3. Job reassignment for a worker with established hearing loss
  4. Audiometric screening for early hearing loss

Explanation

Primary prevention acts before disease occurs by removing or reducing exposure. Screening and rehabilitation act after exposure or after disease detection.

Question 5Core Preventive Medicine

A workplace intervention reduces exposure for the whole workforce. Which metric quantifies the fraction of disease in the population that would be eliminated if exposure were removed?

  1. Population attributable fraction Correct answer.
  2. Number needed to treat
  3. Standardized incidence ratio
  4. Odds ratio

Explanation

The population attributable fraction estimates the proportion of cases in the population attributable to the exposure and thus preventable by removing it. The other measures express association or clinical effort.

Question 6Core Preventive Medicine

Which study design is most appropriate for investigating a rare occupational cancer with a long latency period?

  1. Randomized controlled trial
  2. Retrospective cohort study Correct answer.
  3. Ecological correlation study
  4. Cross-sectional survey

Explanation

A retrospective cohort can assemble historical exposure records and follow outcomes over long latency while capturing enough rare cases. Cross-sectional and ecological designs cannot establish temporal exposure-disease sequence.

Question 7Core Preventive Medicine

A worker's blood lead level is used to decide whether to remove them from lead exposure. This decision is best described as which type of prevention?

  1. Tertiary prevention
  2. Primary prevention
  3. Primordial prevention
  4. Secondary prevention Correct answer.

Explanation

Biological monitoring detects early biological effect before clinical disease, which is secondary prevention. Primary prevention would remove exposure before absorption occurs.

Question 8Core Preventive Medicine

Which of the following best defines the occupational exposure limit known as a threshold limit value-time-weighted average?

  1. A short-term exposure limit averaged over 15 minutes
  2. A concentration immediately dangerous to life or health
  3. A ceiling concentration never to be exceeded for any duration
  4. An average airborne concentration over an 8-hour workday to which nearly all workers may be repeatedly exposed Correct answer.

Explanation

The time-weighted average reflects an 8-hour workday exposure averaged over the shift. Ceiling and short-term limits address brief peak exposures, and IDLH addresses acute escape conditions.

Question 9Core Preventive Medicine

A cohort study reports a standardized mortality ratio of 150 for a dust-exposed group. How is this interpreted?

  1. Observed deaths are 150% higher than expected from reference rates
  2. Mortality risk is 1.5 times lower than the reference population
  3. The exposure causes 150 excess deaths per 1000 workers
  4. Observed deaths are 50% higher than expected from reference rates Correct answer.

Explanation

A standardized mortality ratio of 150 means observed deaths are 150% of expected, or 50% excess. It is a ratio, not an absolute rate difference.

Question 10Core Preventive Medicine

Which measure of disease frequency is most appropriate for describing the rapid onset of acute solvent intoxication among workers during a single shift?

  1. Point prevalence at the end of the shift
  2. Lifetime cumulative incidence
  3. Incidence proportion during the shift Correct answer.
  4. Case-fatality ratio

Explanation

Incidence proportion captures new cases arising in a defined at-risk period, fitting acute events during a shift. Lifetime cumulative incidence and case-fatality answer different questions.

Question 11Core Preventive Medicine

Which feature distinguishes a case-control study from a cohort study in occupational epidemiology?

  1. Disease frequency is measured as incidence in both groups
  2. Participants are selected by outcome status and exposure is assessed retrospectively Correct answer.
  3. Participants are selected by exposure status and followed forward for outcomes
  4. Exposure is randomly assigned by the investigator

Explanation

Case-control studies sample on disease status and look back at exposure, whereas cohort studies sample on exposure and follow forward. Random assignment defines a trial, not either observational design.

Question 12Core Preventive Medicine

A new pre-employment screening test has sensitivity of 90% and specificity of 95% for a condition with 1% prevalence. Approximately what proportion of positive results will be true positives?

  1. About 15% Correct answer.
  2. About 90%
  3. About 50%
  4. About 95%

Explanation

With 1% prevalence, true positives are 0.01×0.90=0.009 and false positives are 0.99×0.05≈0.0495, giving a positive predictive value near 0.009/0.0585, about 15%. Low prevalence sharply lowers predictive value despite good test characteristics.

Question 13Core Preventive Medicine

Which of the following is the most direct purpose of medical surveillance in an occupational health program?

  1. Determining whether a worker is fit for hire
  2. Detecting early biological or health effects in exposed workers Correct answer.
  3. Replacing engineering controls with personal monitoring
  4. Establishing legal liability for workplace injury

Explanation

Medical surveillance aims to detect early changes in exposed workers so that intervention can prevent progression. It does not determine fitness for hire or substitute for exposure controls.

Question 14Core Preventive Medicine

A workplace health promotion program reports reduced absenteeism after introducing a fitness initiative, but participation was voluntary. Which threat to validity is most likely?

  1. Confounding by latency period
  2. Self-selection bias among healthier participants Correct answer.
  3. Information bias from exposure misclassification
  4. Ecological fallacy

Explanation

Voluntary participation allows healthier or more motivated workers to enroll, creating self-selection bias that can exaggerate apparent benefit. Latency and ecological fallacy apply to different designs.

Question 15Core Preventive Medicine

Which of the following best describes confounding in an occupational study?

  1. Differential recall of exposure between cases and controls
  2. Random error that varies around the true value
  3. Loss to follow-up that reduces study power
  4. A third factor associated with both exposure and outcome that distorts the observed association Correct answer.

Explanation

A confounder is related to both exposure and outcome and is not on the causal pathway, so it distorts the measured association. The other options describe random error, recall bias, and attrition.

Question 16Core Preventive Medicine

Which of the following is the most appropriate first step in controlling a newly identified occupational hazard?

  1. Instituting periodic medical screening
  2. Substitution or engineering control at the source Correct answer.
  3. Posting warning signs at the worksite
  4. Issuing personal protective equipment to all workers

Explanation

The hierarchy of controls places elimination, substitution, and engineering controls ahead of administrative measures and personal protective equipment. Source control is most effective because it protects all workers without reliance on individual behavior.

Question 17Core Preventive Medicine

In a study of occupational asthma, exposure is measured with substantial random error that is similar for cases and non-cases. What is the most likely effect on the observed association?

  1. No effect on the point estimate
  2. Exaggeration away from the null
  3. Attenuation toward the null Correct answer.
  4. Systematic reversal of the association

Explanation

Non-differential misclassification of a binary exposure generally biases the estimate toward the null. Differential misclassification can bias in either direction, but random nondifferential error attenuates.

Question 18Core Preventive Medicine

Which of the following best describes the purpose of a sentinel health event in occupational surveillance?

  1. A statistical outlier in mortality data
  2. A routinely collected measure of workplace injury rates
  3. A threshold for regulatory enforcement action
  4. An avoidable case of disease that signals a failure of prevention Correct answer.

Explanation

A sentinel health event is an unnecessary case of disease or death that indicates prevention failed and warrants investigation. It is not merely a rate or an enforcement threshold.

Question 19Core Preventive Medicine

A worker with a positive tuberculin skin test but no symptoms or radiographic findings is identified during pre-placement evaluation. This finding represents which category?

  1. Active disease requiring immediate isolation
  2. A false positive requiring no action
  3. Latent infection requiring secondary prevention Correct answer.
  4. A contraindication to all future employment

Explanation

A positive test without symptoms or radiographic findings indicates latent infection, which is managed with treatment to prevent progression. Active disease would require isolation, and a positive test is not an absolute bar to employment.

Question 20Core Preventive Medicine

Which of the following is true regarding the use of personal protective equipment as a control measure?

  1. It requires no monitoring once issued
  2. It eliminates the hazard at its source
  3. It provides equivalent protection to engineering controls
  4. Its effectiveness depends on proper fit, training, and consistent use Correct answer.

Explanation

Personal protective equipment is the last line of defense and depends on correct selection, fit, training, and adherence. It does not remove the hazard and requires ongoing program oversight.

Question 21Core Preventive Medicine

A cluster of respiratory illness appears among workers in a single building. Which initial epidemiologic approach is most appropriate?

  1. Immediate randomized trial of ventilation interventions
  2. Descriptive analysis by person, place, and time to generate hypotheses Correct answer.
  3. Case-control study with retrospective exposure recall
  4. Cohort study with 20-year follow-up

Explanation

Outbreak investigation begins with descriptive epidemiology characterizing cases by person, place, and time to generate and test hypotheses. Analytic designs follow once the descriptive picture is clear.

Question 22Core Preventive Medicine

Which of the following best describes the difference between incidence and prevalence?

  1. Incidence measures existing cases, prevalence measures new cases
  2. Incidence measures new cases over time, prevalence measures existing cases at a point or period Correct answer.
  3. Both measure new cases but differ in denominator
  4. Prevalence applies only to fatal diseases

Explanation

Incidence quantifies new cases arising in a population at risk over time, whereas prevalence quantifies all existing cases at a given time. They differ in numerator and interpretation.

Question 23Core Preventive Medicine

A worker is exposed to a substance with a biological exposure index. What does this index represent?

  1. The maximum allowable airborne concentration in the workplace
  2. The threshold for regulatory citation
  3. The airborne concentration immediately dangerous to life
  4. A guidance value for the concentration of a biomarker in biological specimens Correct answer.

Explanation

Biological exposure indices are guidance values for biomarkers measured in biological specimens such as blood or urine. Airborne limits and IDLH describe air concentrations, not biomarker levels.

Question 24Core Preventive Medicine

In a cohort study, 100 exposed workers and 100 unexposed workers are followed, with 20 and 10 cases respectively. What is the relative risk?

  1. 1.5
  2. 2.0 Correct answer.
  3. 10.0
  4. 0.5

Explanation

Risk in exposed is 20/100=0.20 and in unexposed is 10/100=0.10, giving a relative risk of 2.0. The risk difference would be 0.10, which is a different measure.

Question 25Core Preventive Medicine

Which of the following best describes the rationale for pre-placement medical evaluation in occupational health?

  1. Detecting early occupational disease
  2. Replacing periodic medical surveillance
  3. Determining compensation eligibility
  4. Establishing a baseline and identifying conditions that could affect fitness or susceptibility Correct answer.

Explanation

Pre-placement evaluation establishes baseline health and identifies conditions affecting fitness or susceptibility to specific hazards. It is not designed to detect occupational disease, which is the role of surveillance.

Question 26Core Preventive Medicine

Which of the following best describes the primary goal of occupational health screening?

  1. To diagnose occupational diseases in symptomatic workers
  2. To detect early signs of work-related disease in asymptomatic workers Correct answer.
  3. To assess fitness for duty after an injury
  4. To determine workers' compensation eligibility

Explanation

Screening aims to identify unrecognized disease or risk factors in apparently healthy individuals, allowing early intervention. It is distinct from diagnostic testing, which is for symptomatic individuals, and from administrative or rehabilitation assessments.

Question 27Core Preventive Medicine

Which of the following is the most appropriate action when a worker's airborne exposure exceeds the occupational exposure limit despite engineering controls?

  1. Rotate workers to reduce individual exposure duration
  2. Implement additional engineering controls or administrative measures Correct answer.
  3. Provide respiratory protection as the primary control
  4. Increase the frequency of medical surveillance

Explanation

The hierarchy of controls prioritizes elimination, substitution, and engineering controls before relying on administrative measures or personal protective equipment. Respiratory protection is the last line of defense and should not be the primary control when exposures exceed limits.

Question 28Core Preventive Medicine

Which of the following best describes the purpose of a workplace hazard assessment?

  1. To assign blame for previous incidents
  2. To comply with recordkeeping requirements
  3. To determine the cost of implementing safety measures
  4. To identify and evaluate potential sources of harm to workers Correct answer.

Explanation

A hazard assessment systematically identifies and evaluates workplace hazards to inform control measures. It is not primarily about cost, blame, or recordkeeping, although documentation may follow.

Question 29Core Preventive Medicine

A worker develops dermatitis after handling a new solvent. Which of the following is the most appropriate initial step in exposure control?

  1. Implement administrative controls such as job rotation
  2. Increase ventilation in the work area
  3. Substitute the solvent with a less hazardous material Correct answer.
  4. Provide the worker with personal protective equipment

Explanation

The hierarchy of controls places elimination and substitution at the top. Substituting a hazardous substance with a safer alternative is the most effective way to prevent exposure and should be considered first.

Question 30Core Preventive Medicine

Which of the following is an example of a primary prevention strategy in occupational health?

  1. Pre-employment screening for susceptibility
  2. Periodic medical examinations
  3. Rehabilitation after a workplace injury
  4. Engineering controls to reduce exposure Correct answer.

Explanation

Primary prevention aims to prevent the onset of disease or injury by eliminating or reducing exposure before harm occurs. Engineering controls achieve this by modifying the workplace or process. Screening and periodic exams are secondary prevention, and rehabilitation is tertiary.

Question 31Core Preventive Medicine

Which of the following best describes the role of a biological exposure index (BEI) in occupational health?

  1. It indicates the airborne concentration below which no health effects are expected
  2. It provides a reference value for interpreting biological monitoring results Correct answer.
  3. It determines the required frequency of medical examinations
  4. It specifies the maximum allowable concentration in the workplace air

Explanation

BEIs are reference values for biological monitoring, representing levels of exposure indicators in biological media that correspond to acceptable exposures. They are not airborne limits or medical examination schedules.

Question 32Core Preventive Medicine

A worker with a history of asthma is being considered for a job involving exposure to known respiratory sensitizers. Which of the following is the most appropriate pre-placement action?

  1. Place the worker on medical surveillance without job modification
  2. Require the worker to sign a waiver of liability
  3. Exclude the worker from the job to prevent exacerbation
  4. Perform a targeted medical evaluation to assess fitness and recommend accommodations Correct answer.

Explanation

Pre-placement evaluation should individualize assessment and consider accommodations rather than blanket exclusion. A targeted evaluation helps determine whether the worker can safely perform the job with reasonable modifications.

Question 33Core Preventive Medicine

Which of the following best describes the purpose of an occupational health surveillance program?

  1. To enforce compliance with safety regulations
  2. To provide direct clinical care for occupational injuries
  3. To monitor trends in worker health and identify emerging hazards Correct answer.
  4. To conduct research on occupational disease causes

Explanation

Surveillance involves systematic collection, analysis, and interpretation of health data to identify patterns and emerging issues. It is distinct from clinical care, enforcement, and research.

Question 34Core Preventive Medicine

Which of the following is the most important limitation of using personal protective equipment (PPE) as a control measure?

  1. It requires frequent training and fit testing
  2. Its effectiveness depends on correct and consistent use Correct answer.
  3. It is expensive to maintain
  4. It is often uncomfortable for workers

Explanation

PPE is highly dependent on human behavior; if not worn correctly or consistently, it provides little protection. While training and cost are concerns, the critical limitation is that proper use cannot be guaranteed.

Question 35Core Preventive Medicine

Which of the following best defines the term 'occupational exposure limit'?

  1. The duration of exposure that is considered safe for all workers
  2. The concentration of a substance in a worker's blood that indicates overexposure
  3. The level of exposure at which health effects are first observed
  4. The maximum concentration of a substance in workplace air to which workers may be exposed Correct answer.

Explanation

Occupational exposure limits are regulatory or advisory limits on airborne concentrations of hazardous substances in the workplace, intended to protect workers. They are not biological levels or exposure durations.

Question 36Core Preventive Medicine

A worker is exposed to a chemical that is a known carcinogen. Which of the following is the most appropriate approach to risk management?

  1. Assume a threshold dose below which there is no risk
  2. Minimize exposure as low as reasonably achievable Correct answer.
  3. Rely on PPE to prevent all exposure
  4. Set an exposure limit based on a no-observed-adverse-effect level

Explanation

For carcinogens, there is generally no established safe threshold, so the precautionary principle calls for reducing exposure to as low as reasonably achievable (ALARA). This approach does not rely on a threshold or solely on PPE.

Question 37Core Preventive Medicine

Which of the following best describes the purpose of a workplace health promotion program?

  1. To reduce employer healthcare costs by screening out unhealthy workers
  2. To improve worker health and well-being through education and supportive environments Correct answer.
  3. To provide treatment for occupational injuries
  4. To comply with occupational safety regulations

Explanation

Health promotion programs aim to enhance overall worker health through lifestyle interventions, education, and organizational support. They are not about excluding workers or regulatory compliance.

Question 38Core Preventive Medicine

A worker reports symptoms consistent with carpal tunnel syndrome. Which of the following is the most appropriate initial management step in an occupational health setting?

  1. Refer the worker directly for surgery
  2. Immediately restrict the worker from all repetitive tasks
  3. Perform a clinical evaluation and assess workplace ergonomic factors Correct answer.
  4. File a workers' compensation claim without further assessment

Explanation

Initial management should include a clinical assessment to confirm the diagnosis and an evaluation of workplace ergonomic risk factors to guide modifications. Immediate drastic restrictions or referrals are not warranted before evaluation.

Question 39Core Preventive Medicine

Which of the following best describes the concept of 'fit testing' for respiratory protection?

  1. It determines the appropriate assigned protection factor
  2. It verifies that the respirator forms an adequate seal on the wearer's face Correct answer.
  3. It ensures the respirator is comfortable for the worker
  4. It measures the filtration efficiency of the respirator

Explanation

Fit testing assesses the seal between the respirator and the wearer's face to ensure that the expected protection is achieved. It does not test the filter itself or comfort.

Question 40Core Preventive Medicine

Which of the following is the most appropriate method for assessing a worker's exposure to a volatile organic compound?

  1. Personal air sampling in the breathing zone Correct answer.
  2. Area sampling at a fixed location in the workplace
  3. Biological monitoring of urine metabolites
  4. Observation of work practices

Explanation

Personal air sampling in the breathing zone provides the most accurate estimate of an individual worker's inhalation exposure. Area sampling may not reflect personal exposure, biological monitoring reflects absorbed dose but not necessarily airborne concentration, and observation is subjective.

Question 41Core Preventive Medicine

Which of the following best describes the difference between hazard and risk?

  1. Hazard is the probability of harm, while risk is the potential for harm
  2. Hazard is the potential for harm, while risk is the probability of harm Correct answer.
  3. Hazard and risk are synonymous in occupational health
  4. Hazard is always high, while risk is always low

Explanation

A hazard is a source or situation with potential to cause harm, while risk is the likelihood that harm will occur and its severity. They are related but distinct concepts.

Question 42Core Preventive Medicine

Which of the following is the most appropriate action when a worker is diagnosed with an occupational disease that is reportable to a public health authority?

  1. Keep the diagnosis confidential and do not report
  2. Report the case as required by law Correct answer.
  3. Report only if the worker consents
  4. Report only if the employer requests

Explanation

Reportable occupational diseases must be reported to the designated authority as mandated by law, often without requiring worker consent, to enable surveillance and prevention. Confidentiality is maintained through secure reporting systems.

Question 43Core Preventive Medicine

Which of the following best describes the purpose of an occupational health history?

  1. To identify past and current exposures that may affect health Correct answer.
  2. To document the worker's job title and employer
  3. To assess the worker's personality traits
  4. To determine the worker's eligibility for benefits

Explanation

An occupational health history focuses on identifying past and present workplace exposures and their potential health effects, which is essential for diagnosis and prevention. It is not primarily for administrative or personality assessment.

Question 44Core Preventive Medicine

A worker is exposed to noise at 85 dB(A) for 8 hours. Which of the following is the most appropriate hearing conservation measure?

  1. No action is needed because the exposure is below 90 dB(A)
  2. Perform audiometry only if hearing loss is suspected
  3. Provide hearing protection and annual audiometric testing Correct answer.
  4. Provide hearing protection only if the worker requests it

Explanation

At 85 dB(A) over 8 hours, many regulations require a hearing conservation program that includes hearing protection, annual audiometric testing, and training. Waiting for symptoms or requests is not appropriate.

Question 45Core Preventive Medicine

Which of the following best describes the role of the occupational health nurse in a workplace?

  1. To provide health assessments, education, and emergency care Correct answer.
  2. To manage the company's safety budget
  3. To design engineering controls
  4. To conduct workplace inspections for regulatory compliance

Explanation

Occupational health nurses focus on direct worker care, health promotion, and emergency response, often collaborating with other professionals. They do not typically manage budgets or design engineering controls.

Question 46Core Preventive Medicine

A worker with a known allergy to latex is required to use latex gloves. Which of the following is the most appropriate accommodation?

  1. Require the worker to use latex gloves with a liner
  2. Transfer the worker to a different department
  3. Provide non-latex gloves and educate the worker on avoidance Correct answer.
  4. Ask the worker to bring their own gloves

Explanation

The most effective accommodation is to eliminate the allergen by providing non-latex gloves, consistent with the hierarchy of controls. Using latex with a liner does not eliminate exposure, and transfer or self-supply are less appropriate.

Question 47Core Preventive Medicine

Which of the following best describes the purpose of worker training in occupational health and safety?

  1. To ensure workers understand hazards and how to control them Correct answer.
  2. To replace engineering controls
  3. To fulfill insurance requirements
  4. To transfer legal liability from the employer to the worker

Explanation

Training is intended to equip workers with knowledge and skills to recognize and mitigate hazards. It does not absolve employers of responsibility or substitute for engineering controls.

Question 48Core Preventive Medicine

Which of the following is the most appropriate interpretation of a negative result on a screening test with high sensitivity but low specificity?

  1. The result is useful for ruling out disease Correct answer.
  2. The worker is definitely disease-free
  3. The result is likely a false negative
  4. The test should be repeated to confirm

Explanation

A highly sensitive test is good for ruling out disease when negative, because it has a low false-negative rate. However, it may have many false positives due to low specificity, so a positive result requires confirmation.

Question 49Core Preventive Medicine

Which of the following best describes the difference between incidence and prevalence in occupational epidemiology?

  1. Incidence measures existing cases, while prevalence measures new cases
  2. Incidence is always higher than prevalence
  3. Prevalence is only used for acute diseases
  4. Incidence measures new cases over a period, while prevalence measures all cases at a point in time Correct answer.

Explanation

Incidence quantifies new cases occurring in a population over time, reflecting risk. Prevalence quantifies all existing cases at a given time, reflecting burden. They are related but distinct measures.

Question 50Core Preventive Medicine

A worker is exposed to a substance that is a known reproductive hazard. Which of the following is the most appropriate preventive measure?

  1. Remove the worker from the job regardless of exposure level
  2. Monitor the worker's offspring for birth defects
  3. Require the worker to use PPE only
  4. Implement engineering controls and provide information on reproductive risks Correct answer.

Explanation

The most appropriate approach is to control exposure through engineering measures and to inform workers about reproductive risks so they can make informed decisions. Automatic removal may be discriminatory and is not always necessary if exposures are controlled.