Test Directory
Anti-Glutamic Acid Decarboxylase Antibody
Containers - Adult
Sarstedt Monovette Serum Gel Tube (Brown Cap)
|
Volume Range
4.9ml
Additive per Container
Clotting activator/gel |
Containers - Child
|
Sarstedt Monovette Serum Gel Tube (Brown Cap)
|
Volume Range
4.9ml
Additive per Container
Clotting activator/gel |
Reference ranges
Anti-GAD
Normal <5 U/ml
Positive >5 U/ml
Please Note :
GAD Antibodies:
Interpretive guidance for GAD autoantibodies tested in line with Diabetes pathway: (data from Pearson et al, Exeter lab data 2020)
Strong positive ≥ 64 U/ml
Weak positive ≥ 11 U/ml
Equivocal 5.1-10.9 U/ml
Laboratory Site
Old Dalkeith Road
Edinburgh
EH16 4SA
Special instructions for collection
Serum samples only please.
How to request
Trak, ICE, Clinical Immunology request form.
Diabetic screen tests can only be requested via Hospital referrals.
Availability
Normal working hours 9am-5pm Mon-Fri.
Anticipated turnaround
What happens if the result is positive or abnormal
General additional information
Diagnosis of Type 1 Diabetes Mellitus.
Tested alongside Anti-IA2 and Anti-ZnT8
Two forms of GAD, known as GAD65 and GAD67, are recognised. The current assay recognises antibodies to GAD65 which are found in T1DM and approximately 60% of patients with stiff-person syndrome.