Methodology
Enzyme-Linked Immunosorbent Assay (ELISA)
Synonyms
FGF-23, Autosomal Dominant Hypophosphatemic Rickets; Familial Tumoral Calcinosis with Hyperphosphatemia; Fibroblast Growth Factor 23 (FGF23); Oncogenic Osteomalacia; Phosphatonin; X-Linked Hypophosphatemia
Specimen Type
Plasma
Performing Lab
LabCorp
Epic ID
Other Reference Test
Standard TAT
4 Days
Collection Information
Specimen Required
1-2 mL Blood
Container Type
Lavender (EDTA)
Collection Instructions
A morning 12-hour fasting sample is recommended but not required.
Processing Information - Lab Use Only
Transport Temperature
Frozen-Only
Specimen Stability
Room Temp: 16 Hours; Refrigerated: 14 Days (preferred); Frozen: 14 Days
Rejection Criteria
Gross lipemia; Non-plasma sample received; Plasma sample received that is not EDTA
Test Volume Required
1 mL Plasma
Minimum Test Volume
0.3 mL Plasma (does not allow repeat testing)
Processing Instructions
Separate plasma within 60 minutes of collection. Complete a LabCorp requisition and submit with specimen refrigerated. Call LabCorp courier to pick up Monday-Friday.
CPT Codes
83520
Revised
9/24/25
Initials
SA