GAD65, IA-2, and Insulin Autoantibody


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Test Name:
GAD65, IA-2, and Insulin Autoantibody
Reference Lab: QNI
Test Code:
Shipping Temp: Refrigerated: 7 days
Specimen Type: 2 mL serum
CPT Code:
86337, 86341 (x2)
Additional Comments: _
FDA Approved Test: YES_ NO_ LDT_
Medical Director/Pathologist: approved by
Billing Completed by_ Date_ Time_

Test Code

Quest Code

CPT Codes
86337, 86341 (x2)

Glutamic Acid Decarboxylase-65 Antibody
IA-2 Antibody
Insulin Autoantibody

Preferred Specimen
2 mL serum

Minimum Volume
0.4 mL

Transport Temperature
Room temperature

Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 30 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Grossly lipemic

Enzyme Linked Immunosorbent Assay (ELISA) • Radiobinding Assay (RBA)

Setup Schedule
See individual assays

GAD-65 antibodies are detected in 20% of diabetic twins who remain disease-free for long periods of time and in 8% of healthy individuals.

Reference Range
GAD-65 Antibody  <5 IU/mL 
IA-2 Antibody  <5.4 U/mL 
Insulin Autoantibody  <0.4 U/mL 

Performing Laboratory
Quest Diagnostics Nichols Institute
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.