Update Type: Test Code Change
Test Updated: 09/16/2026
Test Overview
Test Methodology

Semi-quantitative Enzyme-Linked Immunosorbent Assay

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 *

0.0-5.0 IU/mL

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

Test Details
Days Set Up
Sunday - Friday
Analytic Time

2 - 4 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 Testing
Reference Laboratory
ARUP Laboratories
Section
Sendout Testing
Specimen Requirements
Collection

Collect specimen in an SST tube. Centrifuge, aliquot ALL serum into a plastic vial and freeze.

Collection Instructions

Collect specimen in an SST tube. Centrifuge, aliquot ALL serum into a plastic vial and freeze.

Normal Volume

1.0 mL serum

Minimum Volume

0.5 mL serum

Storage Temperature
STRICT FROZEN
Additional Information

Test sent to ARUP Laboratories.

Billing
CPT Code
86341
Fee Code
32140
NY State Approved
No