AMERICAN MEDICAL TECHNOLOGISTS — MLT
AMT MLT EXAM AND PRACTICE EXAM
(Version 3) 2026/2027 Official Exam A+
Medical Laboratory Technician Certification — Core Laboratory Domains
A+ QUESTIONS 6 SECTIONS 100% RATIONALES
VERIFIED COMPLETE INCLUDED
CATEGORIES
Section 1: General Laboratory & Quality Assurance
Section 2: Clinical Chemistry
Section 3: Hematology & Coagulation
Section 4: Immunology & Immunohematology
Section 5: Microbiology
Section 6: Urinalysis & Body Fluids
STUVIAACTUALEXAM
Original practice content aligned to public AMT MLT domains • For educational use
, Section 1: General Laboratory & Quality Assurance
Q1. A technologist receives a blood specimen labeled with only the patient’s last name. The requisition lists full name and date
of birth. The specimen is otherwise properly filled. Which action is required?
A. Add the missing identifiers from the requisition and proceed with testing
B. Process the specimen because the last name matches the requisition
C. Call the floor and accept verbal confirmation of identity
D. Reject the specimen and request recollection with complete patient identification
Correct Answer: D
Rationale:
Laboratory specimens must have at least two unique patient identifiers that match the requisition. A single name is insufficient; the specimen must be
rejected and recollected to prevent misidentification errors.
Q2. A chemistry analyzer shows a quality-control result for glucose that is 3.2 standard deviations above the mean. The previous
controls were within limits. Which immediate action is most appropriate?
A. Report patient results and investigate the control later
B. Hold patient results, evaluate the control material and system, and troubleshoot before releasing results
C. Ignore the outlier because only one control point is affected
D. Adjust the calibration factor until the control falls within range
Correct Answer: B
Rationale:
A control exceeding ±3 SD indicates a potential system problem. Patient results must be held until the cause is identified and corrected and
acceptable controls are obtained.
Q3. A laboratory is preparing for a CAP inspection. The inspector asks for evidence that pipettes used for quantitative testing are
accurate. Which documentation satisfies the requirement?
A. Purchase invoices showing the pipettes were bought from a reputable vendor
B. Records of periodic gravimetric or photometric verification of pipette accuracy and precision
C. A note that the same pipettes have been used for five years without complaint
D. A verbal statement that all pipettes look clean
Correct Answer: B
Rationale:
Regulatory and accreditation standards require documented verification of volumetric equipment accuracy at defined intervals. Gravimetric or
photometric checks provide objective evidence.
Q4. A technologist is calculating the coefficient of variation for a control material. The mean is 100 mg/dL and the standard
deviation is 2.5 mg/dL. What is the CV?
A. 0.025%
B. 25%
C. 2.5%
D. 40%
Correct Answer: C
Rationale:
CV (%) = (SD / mean) × 100. (2.) × 100 = 2.5%. The coefficient of variation expresses precision relative to the concentration.
, AMT MLT EXAM AND PRACTICE EXAM (Version 3) — 2026/2027 Page 3
Q5. A fire breaks out in the chemistry department. Which class of fire extinguisher is most appropriate for an electrical instrument
fire?
A. Class A (water) extinguisher
B. Class K (wet chemical) extinguisher designed for cooking oils
C. Class C (CO2 or dry chemical) extinguisher rated for electrical fires
D. Class B (foam) extinguisher only
Correct Answer: C
Rationale:
Class C extinguishers are designated for energized electrical equipment. Using water (Class A) on an electrical fire creates shock and spread
hazards.
Q6. A technologist is reviewing a Levey-Jennings chart and notes a shift of 8 consecutive control values above the mean but still
within ±2 SD. Which interpretation is most accurate?
A. The system is in control; no action is needed
B. A shift suggests a systematic error that requires investigation
C. The control material has expired and must be replaced immediately
D. Random error is the only possible explanation
Correct Answer: B
Rationale:
A shift (abrupt change in the level of control values) indicates systematic error such as calibration drift, reagent lot change, or instrument malfunction
and must be investigated.
Q7. A specimen for coagulation testing arrives partially filled in a light-blue top tube. The technologist knows the
anticoagulant-to-blood ratio is critical. Which action is correct?
A. Accept the tube if the patient is difficult to draw
B. Reject the specimen because underfilling alters the citrate-to-blood ratio and invalidates results
C. Centrifuge and test only the available plasma
D. Add additional citrate to restore the proper ratio
Correct Answer: B
Rationale:
Underfilled light-blue tubes produce excess citrate relative to plasma, falsely prolonging clotting times. Such specimens must be rejected.
Q8. A laboratory safety manual requires that all chemical spills of a certain volume be reported. A technologist spills 50 mL of
concentrated sulfuric acid. Which first action is required?
A. Evacuate non-essential personnel, contain the spill if safe, and follow the laboratory’s chemical spill response protocol
B. Wipe the spill with paper towels and continue working
C. Neutralize with a large volume of water immediately
D. Ignore the spill because the volume is small
Correct Answer: A
Rationale:
Concentrated acid spills require immediate activation of the spill response plan, protection of personnel, and appropriate containment and
neutralization by trained staff.
AMT MLT EXAM AND PRACTICE EXAM
(Version 3) 2026/2027 Official Exam A+
Medical Laboratory Technician Certification — Core Laboratory Domains
A+ QUESTIONS 6 SECTIONS 100% RATIONALES
VERIFIED COMPLETE INCLUDED
CATEGORIES
Section 1: General Laboratory & Quality Assurance
Section 2: Clinical Chemistry
Section 3: Hematology & Coagulation
Section 4: Immunology & Immunohematology
Section 5: Microbiology
Section 6: Urinalysis & Body Fluids
STUVIAACTUALEXAM
Original practice content aligned to public AMT MLT domains • For educational use
, Section 1: General Laboratory & Quality Assurance
Q1. A technologist receives a blood specimen labeled with only the patient’s last name. The requisition lists full name and date
of birth. The specimen is otherwise properly filled. Which action is required?
A. Add the missing identifiers from the requisition and proceed with testing
B. Process the specimen because the last name matches the requisition
C. Call the floor and accept verbal confirmation of identity
D. Reject the specimen and request recollection with complete patient identification
Correct Answer: D
Rationale:
Laboratory specimens must have at least two unique patient identifiers that match the requisition. A single name is insufficient; the specimen must be
rejected and recollected to prevent misidentification errors.
Q2. A chemistry analyzer shows a quality-control result for glucose that is 3.2 standard deviations above the mean. The previous
controls were within limits. Which immediate action is most appropriate?
A. Report patient results and investigate the control later
B. Hold patient results, evaluate the control material and system, and troubleshoot before releasing results
C. Ignore the outlier because only one control point is affected
D. Adjust the calibration factor until the control falls within range
Correct Answer: B
Rationale:
A control exceeding ±3 SD indicates a potential system problem. Patient results must be held until the cause is identified and corrected and
acceptable controls are obtained.
Q3. A laboratory is preparing for a CAP inspection. The inspector asks for evidence that pipettes used for quantitative testing are
accurate. Which documentation satisfies the requirement?
A. Purchase invoices showing the pipettes were bought from a reputable vendor
B. Records of periodic gravimetric or photometric verification of pipette accuracy and precision
C. A note that the same pipettes have been used for five years without complaint
D. A verbal statement that all pipettes look clean
Correct Answer: B
Rationale:
Regulatory and accreditation standards require documented verification of volumetric equipment accuracy at defined intervals. Gravimetric or
photometric checks provide objective evidence.
Q4. A technologist is calculating the coefficient of variation for a control material. The mean is 100 mg/dL and the standard
deviation is 2.5 mg/dL. What is the CV?
A. 0.025%
B. 25%
C. 2.5%
D. 40%
Correct Answer: C
Rationale:
CV (%) = (SD / mean) × 100. (2.) × 100 = 2.5%. The coefficient of variation expresses precision relative to the concentration.
, AMT MLT EXAM AND PRACTICE EXAM (Version 3) — 2026/2027 Page 3
Q5. A fire breaks out in the chemistry department. Which class of fire extinguisher is most appropriate for an electrical instrument
fire?
A. Class A (water) extinguisher
B. Class K (wet chemical) extinguisher designed for cooking oils
C. Class C (CO2 or dry chemical) extinguisher rated for electrical fires
D. Class B (foam) extinguisher only
Correct Answer: C
Rationale:
Class C extinguishers are designated for energized electrical equipment. Using water (Class A) on an electrical fire creates shock and spread
hazards.
Q6. A technologist is reviewing a Levey-Jennings chart and notes a shift of 8 consecutive control values above the mean but still
within ±2 SD. Which interpretation is most accurate?
A. The system is in control; no action is needed
B. A shift suggests a systematic error that requires investigation
C. The control material has expired and must be replaced immediately
D. Random error is the only possible explanation
Correct Answer: B
Rationale:
A shift (abrupt change in the level of control values) indicates systematic error such as calibration drift, reagent lot change, or instrument malfunction
and must be investigated.
Q7. A specimen for coagulation testing arrives partially filled in a light-blue top tube. The technologist knows the
anticoagulant-to-blood ratio is critical. Which action is correct?
A. Accept the tube if the patient is difficult to draw
B. Reject the specimen because underfilling alters the citrate-to-blood ratio and invalidates results
C. Centrifuge and test only the available plasma
D. Add additional citrate to restore the proper ratio
Correct Answer: B
Rationale:
Underfilled light-blue tubes produce excess citrate relative to plasma, falsely prolonging clotting times. Such specimens must be rejected.
Q8. A laboratory safety manual requires that all chemical spills of a certain volume be reported. A technologist spills 50 mL of
concentrated sulfuric acid. Which first action is required?
A. Evacuate non-essential personnel, contain the spill if safe, and follow the laboratory’s chemical spill response protocol
B. Wipe the spill with paper towels and continue working
C. Neutralize with a large volume of water immediately
D. Ignore the spill because the volume is small
Correct Answer: A
Rationale:
Concentrated acid spills require immediate activation of the spill response plan, protection of personnel, and appropriate containment and
neutralization by trained staff.
