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Test Code GADAB Glutamic Acid Decarboxylase (GAD) AB

Important Note

Most useful to establish autoimmune etiology in previously diagnosed type 1 diabetes mellitus (DM).

For determining autoimmune DM, perform at least two antibody tests.  In most cases, use glutamic acid

decarboxylase antibody in combination with another antibody test suchas Insulin Antibody, Islet Cell

Cytoplasmic Antibody, IgG and Zinc Transporter 8 Antibody.

Additional Codes

2001771; LAB2480

Preferred Collection Container

SST

Collection Instructions

Routine Venipuncture

Collection Volume

2.0 mL

Minimum Collection Volume

1.0 mL

Rejection Criteria

Grossly hemolyzed specimens.

Specimen Storage and Stability

Ambient: 24 hours; Refrigerated: 1 week; Frozen: 3 months

CPT Code

86341

Alias

Glutamic Acid Decarboxylase, 2001771, 64K antibody, beta cell antibody, GAD-65, GAD65

Methodology

Semi-quantitative Enzyme-Linked Immunosorbent Assay

Acceptable Container

SST, R-NoGel

Transport

Transport to NCL Refrigerated. Transport to ARUP Frozen.

Days and Times Performed

Sunday through Friday

TAT

2-4 days

LOINC

56540-8

Lab Department

Referred Testing