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Insulin, Free : 36700
Test CodeINSFT or 36700
Alias/See Also
Bioactive Insulin; Free Insulin; Non-AB Bound Insulin; Biologically Active Insulin
CPT Codes
83527
Instructions
Overnight fasting is required.
Serum separator tube. Also acceptable: Lavender (EDTA).
Serum separator tube. Also acceptable: Lavender (EDTA).
Transport Container
Centrifuge the serum separator tube and transport; if lavender top, centrifuge and aliquot 0.5 mL plasma into a standard transport tube. (Min: 0.3 mL)
Transport Temperature
Refrigerated.
Specimen Stability
After separation from cells: Ambient: 12 hours; Refrigerated: 7 days; Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis
Methodology
Immunoassay (IA)
Setup Schedule
Tuesday & Thursday
Report Available
3 days (From receipt at performing laboratory)
Limitations
Insulin analogues may demonstrate non-linear cross-reactivity in this assay. Interpret results accordingly.
Reference Range
Insulin, Free 1.5-14.9 uIU/mL
Insulin levels vary widely in specimens taken from non-fasting individuals
Insulin levels vary widely in specimens taken from non-fasting individuals
Clinical Significance
The free insulin measurement is helpful in interpreting blood sugar concentration and its relationship to insulin injections in insulin-treated patients with insulin antibodies.
Performing Laboratory
Quest Diagnostics
