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HelpTest Code LAB1232130 Glutamic Acid Decarboxylase (GAD65) Antibody Assay, Serum
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Reporting Name
GAD65 Ab Assay, SSpecimen Type
SerumOrdering Guidance
This test should not be requested in patients who have recently received radioisotopes, therapeutically or diagnostically, because of potential assay interference. The specific waiting period before specimen collection will depend on the isotope administered, the dose given, and the clearance rate in the individual patient. Specimens will be screened for radioactivity prior to analysis. Radioactive specimens received in the laboratory will be held 1 week and assayed if sufficiently decayed or canceled if radioactivity remains.
Specimen Required
Collection Container/Tube:
Preferred: Red top
Acceptable: Serum gel
Submission Container/Tube: Plastic vial
Specimen Volume: 1.5 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | Reject |
| Gross icterus | Reject |
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 28 days | |
| Frozen | 28 days | ||
| Ambient | 72 hours |
Specimen Minimum Volume
1 mL
Day(s) Performed
Monday through Sunday
Specimen Retention Time
28 daysReport Available
3 to 6 daysReference Values
≤0.02 nmol/L
Reference values apply to all ages.
Useful For
Assessing susceptibility to autoimmune (type 1, insulin-dependent) diabetes mellitus and related endocrine disorders (eg, thyroiditis and pernicious anemia)
Distinguishing between patients with type 1 and type 2 diabetes
Confirming a diagnosis of stiff-man syndrome, autoimmune encephalitis, autoimmune ataxia, brain stem encephalitis, autoimmune epilepsy, autoimmune myelopathy
CPT Code Information
86341
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| GD65S | GAD65 Ab Assay, S | 30347-9 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 81596 | GAD65 Ab Assay, S | 30347-9 |