Specimen Requirements


Insulin-like Growth Factor 1, (IGF-1)

Specimen Requirement

Collect SST/0.5 mL serum, after 30 minutes of clotting, promptly centrifuge and send.

Alternate specimen: Red top

Patient preparation: Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample.


Immunochemiluminometric assay (ICMA)


Room temp: 3 days, Refrigerated: 7 days, Frozen: 90 days

Reference Range

By Report*


3-4 days

Clinical Use

Results of the insulin-like growth factor-1 assay are to be used in conjunction with other clinical and laboratory data to assist the clinician in the assessment of growth disorders.

Test Code