CMT Laboratory Quality Control and Management 2

Question 1

Which statistical measure describes the spread of data points around the mean in a quality control dataset?

Accepted Answer

Standard deviation

Answer

Standard deviation (SD) measures the dispersion or spread of data points around the mean and is the foundation of QC limit setting.

Question 2

On a Levey-Jennings chart, warning limits are most commonly set at:

Accepted Answer

±2 SD from the established mean

Answer

Levey-Jennings charts typically display warning limits at ±2 SD and rejection limits at ±3 SD from the established mean.

Question 3

What is the correct action when a QC failure occurs during a laboratory testing run?

Accepted Answer

Hold patient results, investigate the cause, correct the problem, rerun QC, and then report results

Answer

Upon QC failure, patient results must be held, the cause investigated, corrective action taken, and QC must pass before patient results are reported.

Question 4

What is the primary purpose of a 'delta check' in laboratory quality management?

Accepted Answer

Comparing a patient's current result with their previous result to detect unexpected changes

Answer

Delta checks compare a patient's current laboratory result with a previous result to detect specimen identification errors or clinically unexpected changes.

Question 5

Which type of analytical error causes all test results to consistently shift in one direction away from the true value?

Accepted Answer

Systematic error

Answer

Systematic error causes a consistent, directional shift of all results from the true value, affecting accuracy while precision may be maintained.

CMT - Certified Medical Technologist Practice Test

CMT - Certified Medical Technologist Practice Test

CMT Laboratory Quality Control and Management 2