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Test Directory

Test Directory Insulin, Free (Bioactive)

Insulin, Free (Bioactive)

Test Summary

The free insulin measurement is helpful in interpreting blood sugar concentration and its relationship to insulin injections in insulin-treated patients with insulin antibodies.

Aliases

Specimen Collection

Special Instructions

N/A

Preferred Specimen

0.5 mL serum

Minimum Volume

0.3 mL

Instructions

N/A

Patient Preparation

Overnight fasting is required

Storage

Plastic screw-cap vial

Transport Temperature

Refrigerated (cold packs)

Specimen Stability

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

Limitations

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

Other Acceptable Specimens

Plasma collected in: EDTA (lavender-top) tube

Unacceptable Specimens

N/A

Order Code

INSFR

EPIC (Premier) Code

LAB574

Includes

N/A

CPT Code

83527

Billing Code

670106

CPT Statement

Methodology

Immunoassay (IA)

FDA Status

FDA Approved

Physician Attestation of Informed Consent

N/A

Testing Laboratory

Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano CA, 92675

Department

Reference Testing

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.

Setup Schedule / Expected Turnaround Time

Sunday, Tuesday, Thursday; Report available: 4 - 7 days