Certified Reference Materials (CRMs) are used to...

• A. Materials with known true values traceable to standards; used to calibrate instruments and verify accuracy.
• B. Test color of reagents.
• C. Serve as primary samples for patient testing.
• D. Replace the need for control charts.

Answer: (A)

Certified Reference Materials provide a material with known, certified values that are traceable to national or international standards. They are used to calibrate instruments and verify the accuracy of measurements, so you can quantify bias, confirm instrument performance, and ensure results are comparable across runs, instruments, and labs. Because the assigned values come from an independent standard and come with an uncertainty estimate, CRMs establish traceability and help validate the measurement process. They are not meant for testing the color of reagents, not primary patient samples, and they do not replace control charts; instead, they complement internal QC by offering an external reference for accuracy.