The Glutamic Acid Decarboxylase-65 (GAD-65) test is a blood test that measures the presence of autoantibodies against glutamic acid decarboxylase (GAD), an enzyme that plays a crucial role in regulating insulin production in the pancreas.
This test is primarily used in the diagnosis and monitoring of autoimmune diabetes, particularly Type 1 diabetes. The GAD-65 autoantibodies are directed against the GAD65 protein, which is essential for the proper functioning of the beta cells in the pancreas that produce insulin.
GAD is an enzyme that helps in the synthesis of gamma-aminobutyric acid (GABA), which is a neurotransmitter in the brain. In the pancreatic beta cells, GAD is involved in the production and release of insulin, the hormone that regulates blood glucose levels.
There are two forms of GAD in the body:
The GAD-65 test specifically targets antibodies against the GAD65 form of the enzyme, which is the most relevant for diagnosing Type 1 diabetes.
The GAD-65 test is a blood test in which a sample of your blood is taken and analyzed for the presence of autoantibodies that target GAD65. The test measures the level of these autoantibodies, and the results help doctors understand whether the body’s immune system is attacking its own insulin-producing beta cells.
Diagnosing Type 1 Diabetes: The presence of GAD-65 antibodies is a hallmark of autoimmune diabetes, particularly Type 1 diabetes. These autoantibodies are often present in the early stages of the disease, even before clinical symptoms like hyperglycemia (high blood sugar) appear.
Differentiating Between Type 1 and Type 2 Diabetes: Type 1 diabetes is an autoimmune condition where the body’s immune system attacks its own insulin-producing cells. Type 2 diabetes, on the other hand, is primarily caused by insulin resistance. The GAD-65 test can help differentiate between these two forms of diabetes.
Assessing the Risk of Type 1 Diabetes: People with a family history of Type 1 diabetes or those at high risk may be tested for GAD-65 antibodies to assess their risk of developing the disease.
Monitoring Disease Progression: In some cases, the test may be used to track the progression of autoimmune diabetes and to identify individuals who may be at risk of losing insulin production in the future.
The GAD-65 test is most commonly used in the following scenarios:
Suspected Type 1 Diabetes: When a person shows symptoms of diabetes, such as increased thirst, frequent urination, and unexplained weight loss, the GAD-65 test can help confirm whether the condition is Type 1 diabetes.
Family History of Type 1 Diabetes: People with a family member who has Type 1 diabetes may be tested for GAD-65 antibodies to check if they are at increased risk.
Unexplained Hyperglycemia in Adults: In adults, the GAD-65 test may help determine whether high blood sugar is due to Type 1 diabetes or another cause, especially if the individual is older than the typical age of diagnosis for Type 1 diabetes.
Other Autoimmune Diseases: Sometimes, the test is ordered when other autoimmune diseases are suspected, as GAD-65 antibodies can also be present in individuals with autoimmune diseases, such as Graves’ disease or Addison’s disease.
The GAD-65 test results are generally given in units per milliliter (U/mL), which indicate the concentration of autoantibodies present in the blood.
Negative Result: A negative result indicates no detectable antibodies against GAD65. This suggests that Type 1 diabetes is less likely, but other causes of diabetes should be considered. However, a negative result does not rule out autoimmune diabetes, as some individuals may have low levels of antibodies or other types of autoantibodies.
Positive Result: A positive result indicates the presence of GAD-65 antibodies. The significance of a positive result depends on the concentration of antibodies and the person’s clinical symptoms:
In some cases, GAD-65 antibodies may also be found in people without diabetes, but at lower levels, or in those with other autoimmune conditions.
False Positives and False Negatives: Not all individuals with Type 1 diabetes will test positive for GAD-65 antibodies, and not all individuals with GAD-65 antibodies will develop diabetes. Some people may test positive for the antibodies without ever developing Type 1 diabetes.
Other Autoimmune Diseases: The presence of GAD-65 antibodies is not exclusive to Type 1 diabetes and can also be seen in people with other autoimmune diseases, such as Graves’ disease and Addison’s disease.
Age Factor: GAD-65 antibodies are often present in children and young adults with Type 1 diabetes, but they can be less common in adults with autoimmune diabetes. A positive test may not always confirm a diagnosis of Type 1 diabetes in adults.
Original price was: ₹2,200.00.₹1,999.00Current price is: ₹1,999.00.