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

Coefficient of variation

Answer

Median

Answer

Mode

Question 2

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

Accepted Answer

±2 SD from the established mean

Answer

±1 SD from the established mean

Answer

±3 SD from the established mean

Answer

±4 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

Report patient results and document the QC failure in the log afterward

Answer

Repeat the QC test and report patient results if the repeat passes

Answer

Notify the laboratory director and wait indefinitely for further instructions

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

Verifying instrument calibration against a reference standard

Answer

Assessing QC trends over time using Levey-Jennings charts

Answer

Evaluating the performance of new reagent lots before use

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

Random error

Answer

Proportional error

Answer

Gross error

Question 6

According to CLIA regulations, how often must calibration verification be performed for quantitative laboratory tests?

Accepted Answer

Every 6 months or when specified by the manufacturer

Answer

Daily before patient testing begins

Answer

Weekly on a fixed schedule

Answer

Annually during laboratory inspection

Question 7

What is the primary function of a Laboratory Information System (LIS) in quality management?

Accepted Answer

To manage, store, and accurately transmit patient and QC data

Answer

To automatically generate and analyze QC charts in real time

Answer

To track reagent lot numbers and expiration dates

Answer

To perform delta checks on all patient results across departments