CLC Data Analysis & Reporting Techniques 2

Question 1

A laboratory receives results with a coefficient of variation (CV) of 18% for a quality control sample where the acceptable limit is 10%. What is the most appropriate corrective action?

Accepted Answer

Investigate calibration, reagents, and instrument performance before releasing results

Answer

A CV exceeding the acceptable limit indicates imprecision, requiring root-cause investigation of calibration, reagents, and instrument performance before results can be released.

Question 2

Which statistical method is most appropriate for detecting a gradual upward drift in a laboratory's daily QC values over a two-week period?

Accepted Answer

Linear regression trend analysis

Answer

Linear regression trend analysis is used to detect systematic directional drift in QC data over time by modeling the slope of the data series.

Question 3

In laboratory reporting, a delta check flags a patient's sodium result as 168 mEq/L compared to 138 mEq/L three days prior. What is the primary purpose of this flag?

Accepted Answer

To identify analytically erroneous results or specimen mix-ups by comparing sequential patient values

Answer

Delta checks compare current results to previous results for the same patient to detect specimen mix-ups, transcription errors, or analytical errors.

Question 4

A lab consultant is reviewing a Levey-Jennings chart and notices 10 consecutive QC points all falling on the same side of the mean. Which Westgard rule is violated?

Accepted Answer

10-x rule

Answer

The 10-x rule is triggered when 10 consecutive QC measurements fall on the same side of the mean, indicating systematic bias.

Question 5

When preparing a laboratory performance report for hospital administration, which metric best demonstrates the laboratory's contribution to patient throughput?

Accepted Answer

Turnaround time (TAT) from order to result

Answer

Turnaround time directly reflects how quickly the laboratory delivers actionable results, making it the key metric for demonstrating contribution to patient care throughput.

(CLC) Certified Laboratory Consultant Practice Test

(CLC) Certified Laboratory Consultant Practice Test

CLC Data Analysis & Reporting Techniques 2