I85PREP
⌘ K
LTP12 study materials
LTP12 study resources

LTP12 practice questions

One question at a time. Build your LTP12 understanding.

First 50 of 200 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1General Laboratory Practice, Safety, and Quality Management

Which document states the laboratory's commitment to producing reliable results and serves as the top-level framework for its quality management system?

  1. The safety data sheet
  2. The quality policy Correct answer.
  3. The patient consent form
  4. The equipment inventory

Explanation

A quality policy is issued by top management and formally expresses the laboratory's overall intentions and commitment to quality. It is the highest-level document from which objectives, procedures, and work instructions flow downward in the document hierarchy.

Question 2General Laboratory Practice, Safety, and Quality Management

A laboratory must select a primary reference material to calibrate a chemistry assay. Which characteristic is most important for that material?

  1. It is commutable and has a certified value with stated uncertainty Correct answer.
  2. It is produced in the same country as the laboratory
  3. It has the longest remaining shelf life
  4. It is the least expensive option available

Explanation

A suitable reference material must behave like routine patient samples (commutability) and carry a certified value with a documented uncertainty so metrological traceability can be established. Cost, shelf life, and country of origin are secondary considerations.

Question 3General Laboratory Practice, Safety, and Quality Management

In the hierarchy of laboratory documents, which level typically contains step-by-step instructions for performing a specific test?

  1. Supplier contract
  2. Mission statement
  3. Quality manual
  4. Standard operating procedure Correct answer.

Explanation

Standard operating procedures sit below the quality manual and describe exactly how a task is carried out, including reagents, steps, and acceptance criteria. They translate policy into repeatable bench practice.

Question 4General Laboratory Practice, Safety, and Quality Management

A laboratory's internal audit finds that staff are not documenting refrigerator temperatures on weekends. Which action best addresses the root cause rather than the symptom?

  1. Add a second log sheet to the refrigerator door
  2. Post a reminder sign above the refrigerator
  3. Assign weekend monitoring to a named person and revise the schedule to match staffing Correct answer.
  4. Retrain all staff on the existing temperature log form

Explanation

Corrective action should address why the gap occurred; here the schedule did not match available staffing. Assigning responsibility and adjusting the schedule removes the underlying cause, whereas retraining or reminders only restate an existing requirement.

Question 5General Laboratory Practice, Safety, and Quality Management

Which practice is required before a laboratory employee begins work with a hazardous chemical for the first time?

  1. Obtaining written permission from the chemical supplier
  2. Signing a waiver accepting personal risk
  3. Purchasing personal protective equipment with personal funds
  4. Reviewing the safety data sheet and receiving hazard training Correct answer.

Explanation

Workers must be informed of the hazards of the substances they handle and trained in safe use, spill response, and protective measures before exposure. This information is summarized in the safety data sheet.

Question 6General Laboratory Practice, Safety, and Quality Management

A biological spill of blood occurs on a benchtop. What is the appropriate first step?

  1. Wipe the area immediately with a dry paper towel
  2. Spray the entire room with disinfectant
  3. Leave the area and wait for the spill to dry
  4. Alert others, contain the spill, and apply absorbent material before disinfection Correct answer.

Explanation

Spill response begins with warning others, restricting access, and containing the material so it does not spread. Absorbent material is applied before careful disinfection and disposal according to the exposure control plan.

Question 7General Laboratory Practice, Safety, and Quality Management

Which statement correctly describes the purpose of a fire extinguisher's class rating?

  1. It states the shelf life of the extinguishing agent
  2. It indicates which types of fires the extinguisher is designed to suppress Correct answer.
  3. It indicates the maximum room size the extinguisher can protect
  4. It lists the manufacturer's warranty period

Explanation

Fire extinguisher class ratings indicate suitability for specific fuel types, such as ordinary combustibles, flammable liquids, or energized electrical equipment. Using the wrong class can fail to extinguish a fire or create additional danger.

Question 8General Laboratory Practice, Safety, and Quality Management

Which specimen labeling practice best supports patient safety in the laboratory?

  1. Labeling the container at the bedside immediately after collection using two patient identifiers Correct answer.
  2. Pre-labeling tubes before the patient is identified
  3. Using the room number as the sole identifier
  4. Labeling containers in the laboratory at the end of the shift

Explanation

Labeling at the point of collection with two independent identifiers links the specimen to the patient at the moment of collection. Delayed or pre-collection labeling creates opportunities for misidentification.

Question 9General Laboratory Practice, Safety, and Quality Management

A laboratory reports an external quality assessment result that is an outlier. What is the most appropriate initial response?

  1. Immediately recalibrate every instrument in the department
  2. Report the result again as if it were correct
  3. Investigate the cause, including review of the result, equipment, and reagents Correct answer.
  4. Discontinue participation in the program

Explanation

An unacceptable external quality assessment result triggers a structured investigation to determine whether the cause lies in the method, equipment, reagents, or data handling. Corrective action follows only after the cause is understood.

Question 10General Laboratory Practice, Safety, and Quality Management

Which of the following is the primary purpose of an internal quality control sample run with each batch of patient specimens?

  1. To monitor whether the measurement system is performing within established limits Correct answer.
  2. To verify the patient's identity
  3. To calibrate the instrument before each run
  4. To calculate the laboratory's operating budget

Explanation

Quality control materials of known target values are analyzed alongside patient samples to detect shifts, trends, or imprecision in the measurement system. Control results indicate whether patient results can be accepted.

Question 11General Laboratory Practice, Safety, and Quality Management

A control result falls outside two standard deviations on one side of the mean for a single control material in one run. Which interpretation is most reasonable?

  1. Evidence that the control material has expired
  2. Confirmation that patient results are valid
  3. A warning signal that warrants inspection of the run before results are released Correct answer.
  4. Proof that the instrument is broken and must be replaced

Explanation

A single result beyond two standard deviations is typically treated as a warning that prompts review of the run, such as checking for trends or repeating the control. It does not by itself establish instrument failure or invalidate the material.

Question 12General Laboratory Practice, Safety, and Quality Management

Which element is essential in a laboratory record to ensure the result can be traced back to the person who performed the testing?

  1. The patient's insurance provider
  2. The color of the specimen container
  3. The brand of the laboratory coat
  4. A unique identifier or signature of the analyst with the date Correct answer.

Explanation

Records must identify who performed the work and when, so that results can be reconstructed and accountability established. This supports traceability and is a core requirement of good documentation practice.

Question 13General Laboratory Practice, Safety, and Quality Management

When an error is found in a paper laboratory record, what is the accepted method of correction?

  1. Remove and destroy the original page
  2. Cover the entry with correction fluid
  3. Erase the entry completely so the page looks clean
  4. Draw a single line through the entry, add the correction, and initial and date it Correct answer.

Explanation

Corrections must preserve the original entry so the record remains an accurate history of what occurred. A single line-through with the corrected value, initials, and date keeps both versions visible and attributable.

Question 14General Laboratory Practice, Safety, and Quality Management

Which action best demonstrates the principle of standard precautions in the laboratory?

  1. Using gloves as a substitute for hand hygiene
  2. Wearing gloves only when the patient is known to have an infection
  3. Treating all blood and body fluids as potentially infectious regardless of diagnosis Correct answer.
  4. Sharing eyewear between staff without cleaning

Explanation

Standard precautions require that all blood and body fluids be handled as infectious because infection status is often unknown. This approach protects staff and patients without relying on disclosed diagnoses.

Question 15General Laboratory Practice, Safety, and Quality Management

A centrifuge is found with a broken tube containing an infectious sample. What is the safest sequence of actions?

  1. Open the lid immediately and remove the broken glass by hand
  2. Wait for aerosols to settle, then don protective equipment before cleaning Correct answer.
  3. Restart the centrifuge to spin the debris to the bottom
  4. Spray the interior with disinfectant while the rotor is still spinning

Explanation

Aerosols generated during a centrifuge failure can remain airborne, so the lid should stay closed for a waiting period before cleanup. Protective equipment is then donned and the interior disinfected according to procedure.

Question 16General Laboratory Practice, Safety, and Quality Management

Which of the following best describes the role of a laboratory safety officer?

  1. Coordinating hazard assessments, training, and compliance with safety requirements Correct answer.
  2. Approving marketing materials for the laboratory
  3. Reviewing only the laboratory's financial statements
  4. Performing all patient testing personally

Explanation

A safety officer coordinates risk assessment, training, incident review, and adherence to applicable safety regulations. The role is advisory and operational, supporting the whole laboratory rather than a single technical bench.

Question 17General Laboratory Practice, Safety, and Quality Management

A laboratory wants to reduce the chance that a fatigue-related error affects night-shift testing. Which control is most directly preventive?

  1. Designing schedules with adequate rest periods and limiting consecutive shifts Correct answer.
  2. Posting the error rate on a notice board
  3. Increasing the number of tests each technologist performs
  4. Adding a second review of results after errors occur

Explanation

Preventive controls act on the cause before an error occurs; here the cause is fatigue, so schedule design and rest limits are the direct remedy. Detection and monitoring measures act after the fact.

Question 18General Laboratory Practice, Safety, and Quality Management

Which of the following is an example of an external proficiency testing program?

  1. An organizer sends unknown samples to many laboratories and compares their results Correct answer.
  2. Two technologists split a patient sample and test it in parallel
  3. A supervisor reviews control charts at the end of the month
  4. A vendor demonstrates a new analyzer in the laboratory

Explanation

External proficiency testing provides blind samples to multiple laboratories so that performance can be compared against peers and a target value. Internal comparisons and chart reviews are examples of internal quality monitoring.

Question 19General Laboratory Practice, Safety, and Quality Management

A new lot of quality control material is placed into service. What must be established before its results can be interpreted against control limits?

  1. The price paid for the material
  2. A laboratory-specific mean and acceptable range from replicate measurements Correct answer.
  3. The number of vials stored in the refrigerator
  4. The name of the manufacturer's sales representative

Explanation

Each new control lot must be evaluated in the laboratory to establish its own mean and control limits, because values may differ between lots and between laboratories. Results are then judged against these locally verified limits.

Question 20General Laboratory Practice, Safety, and Quality Management

Which of the following statements about a corrective action is accurate?

  1. It documents the original error without changing any process
  2. It applies only to financial discrepancies
  3. It eliminates the cause of a detected nonconformity to prevent recurrence Correct answer.
  4. It replaces the need for internal audits

Explanation

Corrective action goes beyond fixing the immediate problem by identifying and removing its root cause so the same nonconformity does not recur. It is distinct from correction, which only repairs the specific instance.

Question 21General Laboratory Practice, Safety, and Quality Management

A laboratory receives a complaint that a result was reported with the wrong units. Which first step best fits a quality management approach?

  1. Wait until the next audit to review the complaint
  2. Tell the complainant that no error is possible
  3. Record the complaint and begin a documented investigation of the report and its source Correct answer.
  4. Delete the report from the system

Explanation

Complaints must be captured and investigated through a documented process so the cause can be determined and the impact assessed. Immediate denial, destruction of records, or delay undermines the investigation.

Question 22General Laboratory Practice, Safety, and Quality Management

Which practice best protects the integrity of electronic laboratory records?

  1. Disabling automatic timestamps to speed data entry
  2. A single shared login for the whole department
  3. Passwords written on a note attached to the monitor
  4. Unique user accounts with access controls and an audit trail Correct answer.

Explanation

Unique accounts make actions attributable to individuals, while access controls and audit trails preserve a reliable history of data entry and modification. Shared credentials and exposed passwords destroy that accountability.

Question 23General Laboratory Practice, Safety, and Quality Management

A laboratory is validating a new test method before use. Which comparison provides the strongest evidence that the method is acceptable for patient care?

  1. The new method is faster than the old one
  2. The new method was recommended by a colleague
  3. The new method uses less electricity
  4. Results from the new method agree closely with an established method across the clinically relevant range Correct answer.

Explanation

Method validation must demonstrate that results are accurate and comparable to an accepted method across the range where clinical decisions are made. Speed, cost, and personal recommendation do not establish analytical performance.

Question 24General Laboratory Practice, Safety, and Quality Management

Which waste stream is appropriate for discarded, unbroken glass that has contacted a biological specimen?

  1. A cardboard box stored in the hallway
  2. The staff kitchen trash can
  3. A designated sharps or biohazardous waste container according to the exposure control plan Correct answer.
  4. The ordinary office recycling bin

Explanation

Contaminated glass must be segregated into the waste stream designated for biohazardous sharps so that handlers are protected and regulatory requirements are met. Ordinary waste or recycling streams create injury and exposure risks.

Question 25General Laboratory Practice, Safety, and Quality Management

A laboratory holds a monthly meeting to review incidents, control failures, and audit findings with staff. Which quality activity does this best represent?

  1. External proficiency testing
  2. Management review of quality performance to drive improvement Correct answer.
  3. Method calibration
  4. Patient consent verification

Explanation

Regular review of quality data by leadership and staff supports planning and improvement, allowing resources to be directed at identified problems. It is a governance activity rather than an analytical or administrative one.

Question 26General Laboratory Practice, Safety, and Quality Management

Which organization publishes the international standard that many medical laboratories use as the basis for their quality management system?

  1. The College of American Pathologists
  2. The Clinical and Laboratory Standards Institute
  3. The International Organization for Standardization Correct answer.
  4. The World Health Organization

Explanation

ISO publishes the ISO 15189 standard, which sets out requirements for quality and competence in medical laboratories and is widely used as the framework for laboratory quality management systems. Other bodies issue guidelines or accreditation programs, but the international standard itself comes from ISO.

Question 27General Laboratory Practice, Safety, and Quality Management

A laboratory stores a flammable solvent in a cabinet. Which practice is most appropriate for reducing fire risk?

  1. Store it near the bench for quick access during testing
  2. Keep it in a approved flammable-storage cabinet away from ignition sources Correct answer.
  3. Place it beside the autoclave so heat keeps vapors dispersed
  4. Keep the container open to prevent pressure buildup

Explanation

Flammable liquids should be kept in a designated flammable-storage cabinet, away from heat and ignition sources, to limit vapor accumulation and fire spread. Keeping containers closed and away from hot equipment reduces the chance of ignition.

Question 28General Laboratory Practice, Safety, and Quality Management

A laboratory technician notices that a reagent bottle in use has passed its expiration date but still appears clear. What is the most appropriate action?

  1. Continue using it until the current batch of testing is finished
  2. Use it only for urgent samples and note the date in the log
  3. Dilute it with fresh reagent to extend its usable life
  4. Remove it from service and replace it with an in-date reagent Correct answer.

Explanation

Expired reagents must be removed from service because their performance and stability can no longer be assured, which can compromise patient results. Appearance alone is not evidence of acceptable performance.

Question 29General Laboratory Practice, Safety, and Quality Management

During review of a run, a technologist finds that a transcription error caused a patient result to be entered as 7.0 instead of 70. The result has already been released. Which action sequence best reflects sound laboratory practice?

  1. Correct the result, notify the clinician, and document the event through the incident system Correct answer.
  2. Delete the original entry so only the correct value remains
  3. Silently correct the value in the record and continue working
  4. Wait for the next scheduled audit to raise the issue

Explanation

A released result that is wrong must be corrected promptly, the affected clinician must be informed so patient care can be adjusted, and the event must be documented so the cause can be investigated and prevented. Records should retain an audit trail rather than being erased.

Question 30General Laboratory Practice, Safety, and Quality Management

A laboratory is planning how to respond if its main analyzer fails during a busy morning. Which element contributes most to a resilient continuity plan?

  1. A verbal understanding among senior staff about who will call the service engineer
  2. A documented backup arrangement with defined triggers, responsibilities, and communication steps Correct answer.
  3. An agreement to postpone all testing until the analyzer is repaired
  4. A list of instrument serial numbers kept in the quality manual

Explanation

An effective continuity plan is written in advance and specifies what triggers activation, who does what, how clinicians are informed, and how testing is redirected. Documented roles and triggers allow the response to proceed consistently even when key staff are absent.

Question 31Specimen Collection, Handling, and Processing

Which additive is present in a light blue–top blood collection tube used for coagulation testing?

  1. Potassium EDTA
  2. Lithium heparin
  3. Sodium fluoride
  4. Sodium citrate Correct answer.

Explanation

Light blue–top tubes contain a fixed concentration of sodium citrate, which binds calcium and reversibly prevents clotting so coagulation assays can be performed. The tube must be filled to the marked volume because the citrate-to-blood ratio is calibrated.

Question 32Specimen Collection, Handling, and Processing

Blood collected in a tube containing EDTA is most appropriate for which purpose?

  1. Routine coagulation panel
  2. Complete blood count with differential Correct answer.
  3. Serum chemistry panel
  4. Blood culture

Explanation

EDTA preserves cell morphology and prevents clotting by chelating calcium, making it the standard anticoagulant for hematology counts and smears. Serum chemistry requires a clot tube, and coagulation requires citrate.

Question 33Specimen Collection, Handling, and Processing

What is the correct order of draw when collecting a serum tube, a sodium citrate tube, and an EDTA tube by syringe or with a winged set?

  1. Serum, citrate, EDTA Correct answer.
  2. Citrate, serum, EDTA
  3. EDTA, serum, citrate
  4. Serum, EDTA, citrate

Explanation

When using a syringe or winged collection set, a sterile or non-additive tube is drawn first, followed by citrate, then other additive tubes such as EDTA. This sequence prevents additive carryover between tubes.

Question 34Specimen Collection, Handling, and Processing

A phlebotomist must collect a citrate tube, a heparin tube, and a serum tube by evacuated tube method. Which order is correct?

  1. Heparin, citrate, serum
  2. Serum, citrate, heparin Correct answer.
  3. Serum, heparin, citrate
  4. Citrate, serum, heparin

Explanation

In the standard evacuated tube order of draw, clot activator serum tubes precede citrate tubes, which precede heparin tubes. Following this sequence minimizes additive cross-contamination between specimens.

Question 35Specimen Collection, Handling, and Processing

Why should a light blue citrate tube be discarded and redrawn if it fills only halfway?

  1. The citrate will precipitate at room temperature
  2. The blood-to-anticoagulant ratio is altered, shortening clotting times Correct answer.
  3. The specimen becomes contaminated with skin flora
  4. The tube will hemolyze during centrifugation

Explanation

Underfilling leaves excess citrate relative to plasma, which binds calcium and falsely shortens clotting times such as the PT and aPTT. Tubes with fill lines must be filled to the indicated volume to keep the ratio correct.

Question 36Specimen Collection, Handling, and Processing

Which site is generally preferred for routine venipuncture in an adult?

  1. External jugular vein
  2. Basilic vein
  3. Median cubital vein Correct answer.
  4. Dorsal hand veins

Explanation

The median cubital vein is large, well anchored, and lies away from major arteries and nerves, making it the first-choice site. Alternative sites are used when this vein is unsuitable.

Question 37Specimen Collection, Handling, and Processing

Which complication is most associated with drawing blood from the antecubital area too close to the brachial artery?

  1. Arterial puncture with hematoma formation Correct answer.
  2. Hemoconcentration from prolonged tourniquet use
  3. Specimen hemolysis from small needle gauge
  4. Fainting from patient anxiety

Explanation

The brachial artery runs near the basilic vein, so a needle advanced too deeply or too medially can enter the artery, causing a pulsatile flow and hematoma. Recognizing arterial blood helps the collector apply pressure and stop the procedure.

Question 38Specimen Collection, Handling, and Processing

What is the maximum recommended time a tourniquet should remain in place during venipuncture?

  1. One minute Correct answer.
  2. Ten minutes
  3. Five minutes
  4. Three minutes

Explanation

A tourniquet should be released within about one minute of application. Prolonged constriction causes hemoconcentration, increased potassium and lactate, and hemolysis, all of which alter results.

Question 39Specimen Collection, Handling, and Processing

A blood specimen for a fasting glucose is collected in a tube without preservative and cannot be centrifuged promptly. What is the most likely effect on the glucose result?

  1. Falsely increased bilirubin from light exposure
  2. Falsely increased glucose from hemoconcentration
  3. Falsely decreased glucose from continued cellular glycolysis Correct answer.
  4. Falsely decreased potassium from cellular uptake

Explanation

Cells in whole blood continue to metabolize glucose, so delayed separation lowers the measured glucose. Gray-top tubes with fluoride inhibit glycolysis and are used when processing is delayed.

Question 40Specimen Collection, Handling, and Processing

Which specimen handling error most commonly causes falsely elevated potassium?

  1. Storing the specimen at refrigerator temperature before spinning
  2. Collecting the specimen in a serum tube
  3. Vigorous shaking of the tube after collection Correct answer.
  4. Centrifuging the specimen at the correct speed

Explanation

Vigorous mixing or shaking damages red cells and releases intracellular potassium into the plasma or serum, falsely elevating the result. Tubes should be mixed gently by inversion.

Question 41Specimen Collection, Handling, and Processing

What is the purpose of the antiseptic step before venipuncture?

  1. To numb the skin before needle insertion
  2. To reduce skin flora that could contaminate the specimen or puncture site Correct answer.
  3. To prevent the blood from clotting in the tube
  4. To dilate the vein for easier access

Explanation

Cleansing the site with an appropriate antiseptic reduces resident and transient skin organisms, lowering the risk of contamination and site infection. The antiseptic must be allowed to dry before puncture.

Question 42Specimen Collection, Handling, and Processing

Which practice best prevents contamination of a blood culture specimen?

  1. Using a smaller needle to reduce skin trauma
  2. Drawing the culture after the EDTA tube
  3. Collecting the specimen from an existing intravenous line without cleaning
  4. Cleansing the bottle septum and skin and allowing both to dry before inoculation Correct answer.

Explanation

Blood cultures require careful antisepsis of both the skin and the bottle septa, with adequate drying time to allow the disinfectant to act. This minimizes introduction of skin flora that could be mistaken for bacteremia.

Question 43Specimen Collection, Handling, and Processing

What is the recommended volume of blood per culture bottle for an adult blood culture set?

  1. Approximately 20 to 25 mL
  2. Approximately 0.5 mL
  3. Approximately 1 to 2 mL
  4. Approximately 8 to 10 mL Correct answer.

Explanation

Adult blood culture bottles are designed to receive roughly 8 to 10 mL of blood each, and adequate volume improves detection of bacteremia. Underfilling reduces sensitivity, while overfilling can alter the broth ratio.

Question 44Specimen Collection, Handling, and Processing

Which specimen type is preferred for evaluating a suspected urinary tract infection in an ambulatory patient?

  1. Clean-catch midstream urine Correct answer.
  2. First-voided morning urine
  3. Catheterized urine
  4. 24-hour pooled urine

Explanation

A clean-catch midstream specimen reduces contamination from distal urethral flora and is the standard for routine culture. First-void and pooled specimens are used for other specific purposes.

Question 45Specimen Collection, Handling, and Processing

A urine specimen for routine culture cannot be delivered to the laboratory within one hour. What is the appropriate action?

  1. Refrigerate the specimen at about 4 degrees Celsius Correct answer.
  2. Centrifuge it and submit the supernatant
  3. Add formalin to preserve cells
  4. Store it at room temperature for up to 24 hours

Explanation

Refrigeration slows bacterial multiplication and preserves the specimen when prompt transport is not possible. Prolonged room-temperature storage allows overgrowth that can obscure the true pathogen.

Question 46Specimen Collection, Handling, and Processing

Which stool collection method is appropriate when testing for occult blood?

  1. Collecting the specimen into a urine cup containing boric acid
  2. Collecting the specimen into a transport medium with charcoal
  3. Placing the specimen in formalin
  4. Collecting the specimen in a clean container without preservative Correct answer.

Explanation

Occult blood testing requires a fresh stool sample collected in a clean, dry container without preservative or chemical additives. Contaminating substances such as boric acid or formalin can interfere with the test.

Question 47Specimen Collection, Handling, and Processing

Why is a sputum specimen often collected in the early morning?

  1. Overnight accumulation provides a more concentrated sample Correct answer.
  2. Bacterial counts are lowest at that time
  3. Antibiotics are more effective in the morning
  4. The specimen is more likely to be saliva

Explanation

Sputum accumulates in the airways overnight, so an early-morning specimen is typically more abundant and representative of lower respiratory secretions. The patient should rinse the mouth first to reduce oral contamination.

Question 48Specimen Collection, Handling, and Processing

What is the primary purpose of the chain of custody form in specimen collection?

  1. Recording the patient's insurance information
  2. Documenting each transfer of a specimen for legal purposes Correct answer.
  3. Listing the reference ranges for the tests ordered
  4. Authorizing the phlebotomist to perform the draw

Explanation

A chain of custody records every person who handles a specimen, along with the date and time of each transfer, to preserve legal integrity. It is required for forensic and workplace drug testing.

Question 49Specimen Collection, Handling, and Processing

A specimen for therapeutic drug monitoring is ordered as a trough level. When should the blood be drawn?

  1. Thirty minutes after the dose is given
  2. At any time, because timing does not matter
  3. Immediately after the infusion ends
  4. Just before the next dose is administered Correct answer.

Explanation

A trough level reflects the lowest drug concentration and is drawn just before the next scheduled dose. Proper timing ensures the result can be interpreted against therapeutic ranges.

Question 50Specimen Collection, Handling, and Processing

Which needle gauge is typically used for routine adult venipuncture with a 21-gauge needle being standard?

  1. 12 gauge for routine draws
  2. 23 gauge for fragile veins Correct answer.
  3. 16 gauge for routine draws
  4. 30 gauge for routine draws

Explanation

Routine adult venipuncture commonly uses a 21-gauge needle, with smaller gauges such as 23 used for fragile or small veins. Larger-bore needles are reserved for donation or rapid-flow needs.