Insulin, Free (Bioactive)

Test Code

INSULINFREE

Quest Code

36700

CPT Codes
83527

Preferred Specimen

0.5 mL serum

Patient Preparation

Overnight fasting is required

Minimum Volume

0.3 mL

Other Acceptable Specimens

Plasma collected in: EDTA (lavender-top) tube

Transport Container

Transport tube

Transport Temperature

Refrigerated (cold packs)

Specimen Stability

Room temperature: 12 hours
Refrigerated: 7 days
Frozen: 28 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Hemolysis • Received room temperature

Methodology
Immunoassay (IA)

Setup Schedule

Sun, Tues, Thurs

Report Available

4-7 days

Reference Range

Insulin, Free

1.5-14.9 uIU/mL

Insulin levels vary widely in specimens taken from non-fasting individuals.

Insulin analogues may demonstrate non-linear cross-reactivity in this assay. Interpret results accordingly.

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 Nichols Institute-San Juan Capistrano, CA

33608 Ortega Highway

San Juan Capistrano, CA 92675-2042

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.