Measurement of Fibroblast Growth Factor 23 in plasma
This test was developed, and its performance characteristics determined by LabCorp. It has not been cleared or approved by the Food and Drug Administration.
A morning 12-hour fasting sample is recommended but not required.
Immediately following collection, mix sample thoroughly by gently inverting 8 - 10, times to prevent clotting.
Refrigerated (preferred) – 14 days
Ambient - 16 hours
Frozen - 14 days
Enzyme-linked immunosorbent assay (ELISA). This test is a second-generation C-terminal assay that measures both the intact FGF-23 and its C-terminal fragments.
44 – 215 RU/mL