What is the purpose of instrument calibration and how often should it be performed?

• A. To ensure the results look good; perform as needed.
• B. To ensure accuracy and traceability of results; perform per manufacturer recommendations and regulatory requirements, with checks before use and after maintenance.
• C. To calibrate staff performance; perform monthly.
• D. To calibrate equipment flavor; perform daily.

Answer: (B)

Regular instrument calibration ensures measurements are accurate and traceable to reference standards. This means the instrument’s readings reflect true values, with an auditable link to known, certified references. Over time, drift, wear, or environmental factors can shift results, so calibration corrects for that and preserves the reliability of patient data.

Following the manufacturer’s recommendations is crucial because each device has specific procedures, tolerances, and intervals that match its design and performance, and regulatory requirements provide the minimum quality assurances labs must meet. Performing checks before use verifies the instrument is within spec at the start of a run, while checks after maintenance confirm that service or repairs haven’t altered performance. Together, these practices protect the accuracy and defensibility of results.

Calibration isn’t about appearance, staff performance, or unrelated attributes; it directly supports valid, traceable measurements and compliant laboratory operation.