Local code : GAD
Preferred Sample Type
Min. 0.5ml serum
Specimen Transport
No special arrangements requiredSample Processing in Laboratory
Samples should be centrifuged and stored at -20CTurnaround Time
21-28 DaysSample Stability
Samples Stable at -20 C for long term storageGAD Antibodies (Glutamic Acid Decarboxylase)
General Information
Anti GAD antibodies found in >60% of patients with Stiff Man syndrome, can also be found in patients with Type 1 diabetes. Note, this assay detects anti-GAD65 antibodies. Patients with stiff person syndrome may have antibodies to GAD67. Although there is 65% homology to GAD65, in patients with SPS, false negative anti-GAD by this method may occur. Please contact Immunology in such cases to discuss further testing.
Reference Range
0-5 IU/mL Negative
Source of Reference Range
Reference range derived locallySpecifications
- EQA Scheme?: Yes
- EQA Status: UK NEQAS scheme for Diabetic markers