What does proficiency testing measure?

What does proficiency testing measure?

• A. External benchmark of lab performance compared to peers, detection of bias or drift, require corrective actions.
• B. Internal benchmark only.
• C. Not used in QC.
• D. Replacement of in-house QC materials.

Answer: (A)

Proficiency testing measures how a lab's results compare to those of other laboratories, providing an external benchmark and helping to reveal bias or drift in testing. By analyzing blinded samples from an external organization and comparing performance against peers and reference targets, it highlights deviations that may require corrective actions. It complements internal QC but does not replace it, and it is not used as the sole QC tool or to substitute in-house QC materials.

Proficiency testing measures how a lab's results compare to those of other laboratories, providing an external benchmark and helping to reveal bias or drift in testing. By analyzing blinded samples from an external organization and comparing performance against peers and reference targets, it highlights deviations that may require corrective actions. It complements internal QC but does not replace it, and it is not used as the sole QC tool or to substitute in-house QC materials.