Medical Laboratory Technician  Exam Exam at a Glance

Facts verified Oct 18, 2026 against American Society for Clinical Pathology Board of Certification. Dates that have passed are removed automatically. Practice with the free Medical Laboratory Technician practice test on PracticeTestGeeks (7 questions with answer explanations).

Free Medical Laboratory Technician Exam Study Tools

Interactive Medical Laboratory Technician Exam resources on PracticeTestGeeks, free to start:

• Free Medical Laboratory Technician Questions and Answers — 7 questions with answer explanations
• Medical Laboratory Technician Exam flashcards — review key terms and concepts card by card
• Medical Laboratory Technician Exam study guide — topic-by-topic overview of what the exam covers
• Medical Laboratory Technician Exam cheat sheet — one-page printable summary for last-minute review

What the Medical Laboratory Technician  Exam is and how it works

According to American Society for Clinical Pathology Board of Certification, “To pass the examination, a candidate must obtain a scaled score of 70 or greater.”^[3]

The MLT(ASCP) exam is the ASCP Board of Certification's test for medical laboratory technicians. You take it on a computer at a Pearson testing center, and it has 100 multiple-choice questions. Scores are scaled from 100 to 999, and the minimum passing score is 400. At the end of the exam you see a preliminary pass or fail result on the screen.

Eligibility depends on the route you apply under. You must be able to show the education, training and/or experience that route requires. The routes differ, so check the current list on the ASCP BOC MLT credential page before you apply. The application fee is $235 and cannot be refunded. Once you are approved, you must test within the eligibility period shown in your Admission Notification.

If you do not pass, your next eligibility period starts no earlier than 30 days after your last exam date. Each new application has its own application fee.

Some candidates take the AMT MLT exam instead. It costs $220, which covers the application, the exam and the first annual fee. It lasts 3 hours, and a scaled score of 70 or higher passes. Results are available right after the exam. You must wait 45 days between attempts, and you get at most 4 attempts. Policies can change, so check the details with ASCP or AMT before you apply or book a date.

Worked examples: how to reason through Medical Laboratory Technician  Exam questions

These are practice questions written for this site, not questions from the real exam. Each explanation shows why the right answer is right and why the others are wrong.

Example 1

Question: Which of the following best describes the chain of custody in a laboratory setting?

1. A record documenting every individual who handled a specimen from collection to final disposal
2. A log of equipment maintenance performed during a shift
3. A list of personnel authorized to release patient results
4. A protocol for ordering repeat laboratory tests

Answer: A. A record documenting every individual who handled a specimen from collection to final disposal

Explanation:

A is correct. Chain of custody is a written record of every person who collected, moved, received, tested or stored a specimen, from collection to final disposal. It shows that nobody could have tampered with the specimen or swapped it, which matters most when a result may be used in court.

• B describes an equipment maintenance log. That is about instruments, not a specimen's history.
• C is a list of people allowed to release results. It controls who can report, not who handled the sample.
• D is a protocol for ordering repeat tests, which is a separate workflow.

Rule to remember: chain of custody follows the specimen. It answers who had it, when, and what they did with it, with no gaps from start to finish.

Example 2

Question: Which of the following actions is MOST appropriate when a QC result violates a rejection rule before reporting patient results?

1. Report patient results and repeat QC later
2. Hold patient results, identify the problem, and repeat QC
3. Adjust the QC mean to accept the result
4. Report only results that fall within the reference interval

Answer: B. Hold patient results, identify the problem, and repeat QC

Explanation:

B is correct. A QC rejection means the run may be producing wrong results. Hold patient results, find the cause (reagent, calibration, instrument or the control material itself), fix it, and repeat QC. Report patient results only after QC is acceptable again.

• A releases results that may be wrong before anyone has checked the problem.
• C changes the QC statistics to hide the error. It does not fix anything, and it defeats the purpose of QC.
• D confuses accuracy with the reference interval. A wrong result can still fall inside the normal range.

Rule to remember: when QC fails, stop, troubleshoot, correct and rerun QC before reporting. Also review patient results produced since the last acceptable QC.

Example 3

Question: A new method is being compared to the current reference method using patient samples. Which statistical parameter best expresses the average difference in results between the two methods?

1. Coefficient of variation (CV)
2. Standard deviation (SD)
3. Bias
4. Correlation coefficient (r)

Answer: C. Bias

Explanation:

C is correct. Bias is the average difference between results from the new method and the reference method. It tells you whether the new method reads higher or lower overall, so it measures systematic error.

• A, the coefficient of variation, is the standard deviation divided by the mean. It describes relative imprecision for one method, not the gap between two methods.
• B, the standard deviation, measures how scattered repeated results are, which is random error.
• D, the correlation coefficient, shows how closely the two methods move together in a straight line. Two methods can correlate almost perfectly even if one always reads higher than the other.

Rule to remember: bias means systematic error, or accuracy. SD and CV mean random error, or precision. Correlation shows association, not agreement.

How to use these practice tests

Start with the general MLT question set to get a baseline. Untimed is fine. Note which disciplines cause the most misses.

Next, work through the discipline sets, starting with your weakest areas: blood banking, clinical chemistry, hematology and coagulation, microbiology, immunology and serology, urinalysis and body fluids, lab operations and safety, and molecular diagnostics. Read every explanation, including the ones for questions you got right. Keep an error log: write the rule you missed, not just the answer.

Compare your progress with the current content outline and candidate materials on the ASCP BOC website (or AMT's, if that is your route). Spend more time on any area the official material stresses that you have not practiced enough.

As test day gets close, take mixed sets such as the ASCP-style set and the MCQ set in one sitting to build stamina. In the final days, reread your error log and confirm your eligibility period in your Admission Notification. Also check Pearson's test-center rules.