Commutability assessment of reference materials for homocysteine

Area of Science:

• Clinical Chemistry
• Metrology
• Biomarker Measurement

Background:

• Commutability of reference materials is vital for accurate patient test results and traceability.
• Matrixed reference materials are essential for calibrating measurement methods.
• Homocysteine measurement accuracy relies on commutable reference materials.

Purpose of the Study:

• To evaluate the commutability of homocysteine reference materials.
• To assess the suitability of reference materials for accurate homocysteine testing.
• To identify factors influencing commutability assessment.

Main Methods:

• Measured 30 serum samples and seven homocysteine reference materials using five conventional methods.
• Employed liquid chromatography tandem-mass spectrometry as the reference method.
• Assessed commutability using Clinical and Laboratory Standards Institute EP30-A and International Federation of Clinical Chemistry and Laboratory Medicine guidelines.

Main Results:

• Seven reference materials passed commutability assessment under EP30-A, with 34 method-material combinations found commutable.
• International Federation of Clinical Chemistry and Laboratory Medicine evaluation yielded conclusive results for 28 combinations.
• Seven combinations showed indeterminate commutability results.

Conclusions:

• Homocysteine reference materials exhibit good commutability.
• Measurement procedure sensitivity, deviation, uncertainty, and measurand selection influence commutability results.
• Discrepancies in judgment standards across methods contribute to result variations.