Islet autoantibodies and diabetes mellitus autoantibody panel
This blood test checks for substances called antibodies. These are made by your body in response to insulin and other chemicals related to insulin. Your healthcare provider uses this test to find out whether you have type 1 or type 2 diabetes. Type 1 diabetes is more common in children, teens, and young adults. Type 2 diabetes is the most common type of diabetes. It can happen at any age.
Among the antibodies tested for are:
Islet cell cytoplasmic autoantibodies (ICA)
Glutamic acid decarboxylase autoantibodies (GADA)
Insulinoma-associated-2 autoantibodies (IA-2A)
Insulin autoantibodies (IAA)
If some combination of these antibodies is present in high levels, it could mean you have type 1 diabetes. Or it could mean you are at risk of developing it. These antibodies often show up years before symptoms begin. So this test is useful if you have a family history of type 1 diabetes.
Because people with type 2 diabetes don't have these antibodies, the test is also useful to tell one type of diabetes from the other.
You may need this blood test to confirm that you have type 1 diabetes.
The diabetes antibody panel is just one test used to check for type 1 diabetes. Your healthcare provider may also order a C-peptide test or an insulin assay test.
Before having a diabetes antibody panel to find out if you have type 1 or type 2 diabetes, you may have a random or fasting plasma glucose test. Or you may have an oral glucose tolerance test. A fasting plasma glucose test is a blood test done after you fast for 8 hours. In an oral glucose tolerance test, your blood is checked after you fast for a certain period and then drink a special sugary solution. Many healthcare providers will also do a test called a hemoglobin A1C. This test is used to check for type 2 diabetes.
Test results may vary depending on your age, gender, health history, the method used for the test, and other things. Your test results may not mean you have a problem. Ask your healthcare provider what your test results mean for you.
In general, if the antibodies are present, you could have type 1 diabetes. Or you could be at risk of developing it. If no antibodies are present, you might have type 2 diabetes, although some people with type 1 diabetes will test negative for these antibodies.
The test is done with a blood sample. A needle is used to draw blood from a vein in your arm or hand.
Having a blood test with a needle carries some risks. These include bleeding, infection, bruising, and feeling lightheaded. When the needle pricks your arm or hand, you may feel a slight sting or pain. Afterward, the site may be sore.
Taking insulin before the test will prevent an accurate result.
You don't need to prepare for this test. Be sure your healthcare provider knows about all medicines, herbs, vitamins, and supplements you are taking. This includes medicines that don't need a prescription and any illicit drugs you may use.