Insulin

Test Code

Quest Code

561

CPT Codes
83525

Preferred Specimen

1 mL serum

Patient Preparation
Fasting specimen required.

Minimum Volume

0.5 mL

Transport Container

Plastic screw-cap vial

Transport Temperature

Refrigerated (cold packs)

Specimen Stability

Room temperature: 8 hours
Refrigerated: 7 days
Frozen: 28 days

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

Hemolysis • Plasma • Grossly icteric

Methodology
Immunoassay (IA)

Setup Schedule

Set up: Mon-Sat; Report available: 1-2 days

Reference Range

≤18.4 uIU/mL

Risk	uIU/mL
Optimal	≤18.4
Moderate	N/A
High	>18.4

Adult cardiovascular event risk category cut points (optimal, moderate, high) are based on Insulin Reference interval studies performed at Quest Diagnostics in 2022.

Clinical Significance

For diagnosis and monitoring of diabetes and insulin-secreting tumors.

Performing Laboratory

Quest Diagnostics Nichols Institute

14225 Newbrook Drive

Chantilly, VA 20153

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.