Glutamic Acid Decarboxylase Antibodies (Anti-GAD65) in Serum
This test measures the presence of antibodies against glutamic acid decarboxylase (GAD65), a protein involved in insulin production in the pancreas. It helps evaluate potential autoimmune diabetes, such as type 1 diabetes.
["This test may help diagnose or monitor autoimmune conditions affecting the pancreas."]
Key facts at a glance
- LOINC
- 112068-2
- Short code
- GAD65 Ab CSF IA-aCnc
- Synonyms
- GAD65 Ab CSF IA-aCnc
- Category
- chemistry
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms like unexplained weight loss, frequent thirst, frequent urination, or unexplained fatigue. It may also be used in patients with a family history of type 1 diabetes or other autoimmune diseases.
What to Expect Before the Test
No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw a blood sample. If you are diabetic or on insulin, let your healthcare provider know before the test.
What the Test Results Mean
Positive results indicate the presence of anti-GAD65 antibodies, which can suggest an autoimmune response targeting pancreatic cells. However, results alone do not diagnose diabetes; they are often used alongside other tests and clinical findings.
Common Conditions Linked to Positive Results
Anti-GAD65 antibodies are strongly associated with type 1 diabetes and other autoimmune conditions affecting the pancreas, such as diabetes-related complications or related syndromes. They may also appear in other autoimmune diseases.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Anti-GAD65 antibodies are a key marker for diagnosing and monitoring autoimmune diabetes. High levels may indicate an increased risk of developing type 1 diabetes, especially in individuals with other autoimmune markers or a family history of the disease. Regular monitoring can help manage symptoms and prevent complications.
Short name
Anti-GAD65 Antibody
Frequently asked questions
What does a positive result mean?
Can this test be used to diagnose diabetes?
Are there any side effects from this blood test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy