What is measured: All-trans retinol.
Performance of the assay
Lower limit of detection (LOD): 0.1 µmol/L.
Within-day CV: 4 %; between-day CV: 6 - 8 %.
All-trans retinol is a marker of vitamin A status.
Specimen, collection and processing
Preferred matrix: EDTA plasma.
Volume: Minimum volume is 50 µL, but 200 µL is optimal and allows reanalysis.
Preparation: Serum gel tubes must not be used. Samples should be put on ice, and protected from light.
Transportation; for general instruction on transportation, click here.
Frozen, on dry ice.
Reported values, interpretation
Reported values: 1.5-2.8 µmol/L.
Intraclass correlation coefficient (ICC): 0.87.