Test Overview
Test Methodology

Radioimmunoassay (RIA)

Test Usage

Assessing susceptibility to autoimmune (type 1) diabetes mellitus and related endocrine disorders. Distinguishing between type 1 and type 2 diabetes. Confirming diagnosis of stiff-man syndrome and related autoimmune encephalomyelopathies.

Reference Range *

< or = 0.02 nmol/L

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Monday - Sunday
Analytic Time

3 - 7 days

Soft Order Code
GAD65
MiChart Code
Glutamic Acid Decarboxylase Antibody
Synonyms
  • Anti-GAD
  • GAD (Glutamic Acid Decarboxylase) Antibody
  • GAD 65
  • Glutamate Decarboylase AB
  • ICAB
  • Islet Cell Cytoplasmic Antibody
  • Stiffman Syndrome
Laboratory
Sendout
Reference Laboratory
Mayo GD65S (81596)
Section
Special Testing
Specimen Requirements
Collection Instructions

Collect specimen in red top or SST tube. Centrifuge, aliquot ALL serum into a plastic vial and refrigerate.

Normal Volume
2.0 mL serum
Minimum Volume
1 mL serum
Additional Information

Test sent to Mayo Medical Laboratories.

Billing
CPT Code
86341
Fee Code
32140
NY State Approved
No