Fibroblast Growth Factor 23 (FGF-23)

Diagnostic Use

The FGF-23 assay may be used to investigate persistent unexplained abnormal phosphate metabolism.
FGF (fibroblast growth factor) 23 is involved in regulating phosphate balance.
Raised levels in serum are seen in oncogenic osteomalacia.

Requests for FGF 23 measurement will be vetted by a CHL chemical pathologist before being sent to Australia for testing.

The clinical indication for the test must be written on the request form.
Requests from Endocrinologists will be automatically approved.

Department

Endocrinology Lab

Delphic Registration Code

ENDO

Laboratory Handling

Phlebotomy

Phone 80885- sample must be transported on ice to lab ASAP.

Registration

Phone 80885 - sample needs to be chilled and separated <30 mins after collection.

Separating

Phone 80885 - sample needs to be chilled and separated <30 mins after collection.

Laboratory

Spin sample (within 30 mins collection), separate and freeze ASAP.

Synonyms

FGF23

Turnaround Time

4 weeks

Test Code

ENDO

Specimen Type

• Plasma

Specimen Requirements

Tube/Container Type:

Preferred

• EDTA (Lavender Cap)

Acceptable

• EDTA (Lavender Cap)

Preferred Sample Volume (ml)

2

Minimum Sample Volume (ml)

2

No of Samples Required

1

Aliquot Instructions

Sample Type

• Plasma

Minimum Volume (ml)

2

Transport to Lab

Frozen

Additional Referral/Aliquot Information

Sample must be kept on ice until spun and separated within 30 mins of collection. Once separated aliquot must be frozen ASAP.

Reference Intervals

23.2 – 95.4 ng/L

Test Method

Sendaway test to NSW Royal North Shore Hospital Laboratory, Australia.
Chemiluminescent immunoassay on Diasorin Liaison XL.

Contact Canterbury Health Laboratories on +64 3 364 0484 or email LabInfo@cdhb.health.nz

Additional Costing Information

Test cost $90 AUD as of May 2023, however, most of the cost to the laboratory will involve dry ice shipment expense (>$1000 NZD).

Contact Information

Enquiry Form