Medical Laboratory Technician Exam Medical Laboratory Technician Laboratory Operations and QC Questions and Answers 3

Question 1

A technician notices that the last 10 consecutive QC values all fall on the same side of the mean but within 2 standard deviations. Which Westgard rule is violated?

Accepted Answer

10x

Answer

1-3s

Answer

2-2s

Answer

R-4s

Question 2

Which agency establishes the Clinical Laboratory Improvement Amendments (CLIA) regulations that govern laboratory testing in the United States?

Accepted Answer

CMS

Answer

FDA

Answer

CDC

Answer

OSHA

Question 3

A laboratory is validating a new chemistry analyzer. Which parameter assesses the agreement between the new method and the existing reference method?

Accepted Answer

Method comparison

Answer

Precision

Answer

Accuracy

Answer

Linearity

Question 4

What corrective action should be taken when a Levy-Jennings chart shows a sudden upward shift in control values starting after a reagent lot change?

Accepted Answer

Rerun controls using the previous reagent lot to confirm the new lot is the cause

Answer

Continue testing and monitor for further shifts

Answer

Report all patient results since they are within reportable range

Answer

Perform a new proficiency testing event

Question 5

What does the coefficient of variation (CV) measure in laboratory quality control?

Accepted Answer

The relative standard deviation expressed as a percentage of the mean

Answer

The difference between the highest and lowest control values

Answer

The percentage of results that fall outside 2 standard deviations

Answer

The total number of outlier results in a given month

Question 6

Which laboratory practice is essential for maintaining chain of custody for forensic or legal specimens?

Accepted Answer

Documenting every person who handles the specimen from collection to disposal

Answer

Storing all specimens in a locked refrigerator

Answer

Running duplicate QC samples alongside the specimen

Answer

Using only CLIA-waived testing methods