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Fibroblast Growth Factor 23

Test Codes

EPIC: LAB7598, Beaker: XFIBGF23, Mayo: IFGF23

Department

Send Outs

Specimen Collection Criteria

Collect (preferred specimen): One Gold-top SST tube.
Also acceptable: One plain Red-top tube.

Physician Office/Draw Specimen Preparation

Centrifuge to separate serum from cells. Transport to a plastic transport tube and refrigerate (2-8°C or 36-46°F).

Preparation for Courier Transport

Transport: 0.5 mL serum refrigerated (2-8°C or 36-46°F). (Minimum: 0.25 mL)

Rejection Criteria

Specimens not collected and processed as indicated.

In-Lab Processing

Centrifuge to separate serum from cells. Transport to a plastic transport tube and refrigerate (2-8°C or 36-46°F).

Transport: 0.5 mL serum refrigerated (2-8°C or 36-46°F). (Minimum: 0.25 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): Unacceptable
Refrigerated (2-8°C or 36-46°F): 14 days
Frozen (-20°C/-4°F or below): 90 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to Mayo Clinic Laboratories in Rochester, MN.

Performed

Wednesday.
Results available in 2-9 days.

Reference Range

By report.

Test Methodology

Chemiluminescence Based Quantitative Sandwich Immunoassay.

Clinical Utility

• Diagnosing and monitoring oncogenic osteomalacia.
• Possible localization of occult neoplasms causing oncogenic osteomalacia.
• Diagnosing X-linked hypophosphatemia or autosomal dominant hypophosphatemic rickets.
• Diagnosing familial tumoral calcinosis with hyperphosphatemia.
• Predicting treatment response to calcitriol or vitamin D analogs in patients with renal failure.

CPT Codes

83520

Contacts

Last Updated

10/27/2023