Fibroblast growth factor 23

Alphabetical Test listing

Fibroblast growth factor 23-994

Test name:

Test number:

994

Excellian order number:

LAB994

Abbreviation:

FGF-23

Alternate names:

FGF-23
FGF-23 C-Terminal Fragment

Useful for:

Measurement of Fibroblast Growth Factor 23 in plasma

Limitations:

This test was developed, and its performance characteristics determined by LabCorp. It has not been cleared or approved by the Food and Drug Administration.

Patient preparation information:

A morning 12-hour fasting sample is recommended but not required.

Specimen type:

EDTA plasma

Collection container:

Lavender (EDTA), 4mL

Volume:

1 mL

Minimum volume:

0.3 mL (Note: This volume does not allow for repeat testing)

Collection instructions:

Immediately following collection, mix sample thoroughly by gently inverting 8 - 10, times to prevent clotting.

Processing instructions:

Centrifuge specimen within one (1) hour of collection
Transfer plasma to a Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp), labelled as EDTA plasma
Refrigerate

Transport container:

Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp)

Transport and stability:

Refrigerated (preferred) – 14 days

Ambient - 16 hours

Frozen - 14 days

Reason for rejection:

Gross lipemia
Non-plasma sample received
Plasma sample received that is not EDTA

Performing lab:

LabCorp (004380): R-LC

Days set up:

Fri

TAT:

4 - 10 days

Method:

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.

Reference ranges:

44 – 215 RU/mL

Clinical information:

CPT codes:

83520

LCD/NCD:

46699-5

Date created:

05/29/2019

Revised date:

02/02/2023