Fibroblast Growth Factor 23 (FGF23) Level, Plasma


Sunquest Code:FGFT23  
Epic Code:LAB6784Epic Name:Fibroblast Growth Factor 23
Methodology:Immunometric Enzyme Assay
CPT Code:83520
Turnaround Time:Specimens are sent to reference laboratory Mon-Fri; results are reported within 1-3 days.
Compliance:

This test uses a reagent or kit labeled by the manufacturer as Research Use Only. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.



Collection Instructions

Specimen:Blood
Optimal Volume:3 mL
Minimum\Peds Volume:1.2 mL
Causes for Rejection:Gross hemolysis


Processing and Shipping

Specimen Processing:Centrifuge and aliquot 1.5 mL, 0.5 mL minimum.
Shipping Instructions:Ship at frozen temperatures (preferred).
Test Performed at or Referral Lab Lab Sendouts  (Mayo)
Referral Lab number:FGF23


Interpretive

Reference Range:

 

Normal infants less than 3 months of age

Results may be significantly elevated (i.e., >900 RU/mL)

3 mo - 17 y

≤ 230 RU/mL

 

≤ 180 RU/mL

 

 

Use:Diagnosing and monitoring oncogenic osteomalacia; diagnosing x-linked hypophosphatemia or autosomal dominant hypophosphatemic rickets; predicting treatment response to calcitriol or vitamin D analogs in patients with renal failure.


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