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
Sunday- Thursday
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
  • GAD65
  • Glutamate Decarboylase AB
  • ICAB
  • Islet Cell Cytoplasmic Antibody
  • Stiffman Syndrome
  • GAD65 Ab Assay, S/CSF
  • GAD CSF
  • GAD SERUM
  • GAD65 Ab Assay, CSF
  • GAD65 Ab Assay, Serum
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.

Yellow Top Tube
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
Resources