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Specimen Collection Manual and Test Catalog

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INTACT FIBROBLAST GROWTH FACTOR 23, SERUM

Geisinger Epic Procedure Code:  LAB5259    Geisinger Epic ID:  208038

SPECIMEN COLLECTION
Specimen type: 

Serum


Preferred collection container: 
Alternate collection container: 
4 mL red-top tube (serum separator)
6 mL red-top (plain, non-serum separator) tube
3 mL plain red-top (non-serum separator) tube
Specimen required: 

0.5 mL of serum



SPECIMEN PROCESSING
Processing instructions: 

Centrifuge and aliquot


Transport temperature: 

Refrigerated


Specimen stability: 

Refrigerated:14 days. Frozen: 90 days.


Rejection criteria: 

Gross hemolysis, gross lipemia



TEST DETAILS
CPT code(s):  83520
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.
The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.

Methodology: 
Immunoenzymatic Assay
Synonyms: 

Mayo code IFG23


Doctoral Director(s): 
Randin Nelson MD
Review Date:  05/05/2026

Performing Locations