Glutamic Acid Decarboxylase (GAD) Antibodies
- Description
- The assay detects antibody to the 65kD isoform of GAD. This autoantibody is seen in both type 1 diabetes and stiff person syndrome. GAD 65 is a pancreatic beta cell antigen. This assay is also performed with ZnT8 and IA2 antibodies (see Diabetic Autoantibodies). These autoantibodies are tested for by enzyme-linked immunoassay and is only able to be requested as a complete panel.
- Related condition
- Reference range
- Glutamic acid decarboxylase antibodies, <5.0 IA2 antibodies, <7.5 Zinc Transporter 8 antibodies, <15.0
- Units
- U/ml
- Testing site
- Synnovis : Reference Services : Blackfriars Hub
- Laboratory
- Diagnostic Immunology
- Sample type and volume required
- Clotted (Gold top vacutainer) 4 ml
- Special sample instructions
All tests are compromised by prolonged transit times. For this reason, date of bleed and date of postage must be provided with each request.
- Storage and transport
- Serum stored at 4ºC should be sent by 1st class post as soon as possible
- Turnaround time
- 14 working days
- Time limit for extra tests
- 10 days