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Medical Laboratory Technician Exam
Review With 200 Real Exam Questions And
Correct Detailed Answers (Verified
Answers) Already Graded A+|| Brand New!!
General Laboratory & Quality Assurance
1. A technologist receives a blood specimen labeled with only the patient's last
name. The requisition lists the 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.
2. 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.
3. 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.
,4. 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.
5. 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.
6. 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 control is out of control and patient results should be reported
B. A systematic error is present and should be investigated
C. This is normal random variation
D. The control material is expired
Correct Answer: B
Rationale: A shift of consecutive values above the mean indicates a systematic error
, (bias). Even if values are within ±2 SD, the trend suggests a problem that requires
investigation before reporting patient results.
7. Quality control is best defined as:
A. A process that ensures patient samples are properly labeled
B. A process that monitors the accuracy and reproducibility of results through the use of
control specimens
C. The comparison of an instrument reading to a known standard
D. The calibration of laboratory equipment
Correct Answer: B
Rationale: Quality control (QC) involves running control specimens to monitor the
accuracy and reproducibility of test results over time.
8. A process that monitors the accuracy of results between different laboratories is
called:
A. Quality control
B. Quality assurance
C. Proficiency testing
D. Calibration verification
Correct Answer: C
Rationale: Proficiency testing (PT) is a means by which quality control between
laboratories is maintained, ensuring interlaboratory comparability.
9. Accuracy describes:
A. How close a test result is to the true value
B. The reproducibility of repeated measurements
C. The range of values a test can measure
D. The precision of multiple test runs
Medical Laboratory Technician Exam
Review With 200 Real Exam Questions And
Correct Detailed Answers (Verified
Answers) Already Graded A+|| Brand New!!
General Laboratory & Quality Assurance
1. A technologist receives a blood specimen labeled with only the patient's last
name. The requisition lists the 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.
2. 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.
3. 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.
,4. 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.
5. 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.
6. 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 control is out of control and patient results should be reported
B. A systematic error is present and should be investigated
C. This is normal random variation
D. The control material is expired
Correct Answer: B
Rationale: A shift of consecutive values above the mean indicates a systematic error
, (bias). Even if values are within ±2 SD, the trend suggests a problem that requires
investigation before reporting patient results.
7. Quality control is best defined as:
A. A process that ensures patient samples are properly labeled
B. A process that monitors the accuracy and reproducibility of results through the use of
control specimens
C. The comparison of an instrument reading to a known standard
D. The calibration of laboratory equipment
Correct Answer: B
Rationale: Quality control (QC) involves running control specimens to monitor the
accuracy and reproducibility of test results over time.
8. A process that monitors the accuracy of results between different laboratories is
called:
A. Quality control
B. Quality assurance
C. Proficiency testing
D. Calibration verification
Correct Answer: C
Rationale: Proficiency testing (PT) is a means by which quality control between
laboratories is maintained, ensuring interlaboratory comparability.
9. Accuracy describes:
A. How close a test result is to the true value
B. The reproducibility of repeated measurements
C. The range of values a test can measure
D. The precision of multiple test runs
