Glutamic Acid Decarboxylase GAD 65 Antibody, CSF (Referred Out) - Saskatoon
Discipline
Biochemistry
Overview
Description
Test ordering requirements
Forms required
- Copy of requisition MUST accompany specimen to SPH laboratory
- Fill in the ‘Other tests’ location on the Acute Care Phlebotomy Requisition
Alias
- GAD65 Ab
- CSF
Specimen Information
Specimen types accepted
- CSF
Specimen collection container
- Preferred collection container: Sterile CSF Collection Container
Required volume
- Optimal volume: 1.0 mL CSF
- Minimum volume: 0.75 mL CSF
(Submitting the minimum volume makes it impossible to repeat the test or perform confirmatory/reflex testing. In some situations, a minimum volume may require a second collection.)
Transport and stability
- Refrigerated (preferred) 28 days; Frozen 28 days; Ambient 72 hours
Rejection criteria
- Gross hemolysis, lipemia or icterus
- Specimens received where the collection protocols were not followed
- Pathology and Laboratory Medicine Acceptance and Rejection Criteria
Testing Information
Relevant clinical history
- 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 one week and assayed if sufficiently decayed, or canceled if radioactivity remains.
Clinical interpretation
- Possible use in evaluating patients with autoimmune encephalitis, stiff-person syndrome, autoimmune ataxia, and other acquired central nervous system disorders.
Performance
Days/times performed
Availability |
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Testing site |
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Maximum laboratory time
- 5 - 7 day turnaround time by testing laboratory
Last Updated: October 9, 2024