The anti-insulin antibody test checks to see if your body has produced antibodies against insulin.
Antibodies are proteins the body produces to protect itself when it detects anything "foreign," such as a virus or transplanted organ.
How the Test is Performed
A blood sample is needed.
How to Prepare for the Test
No special preparation is needed.
How the Test will Feel
When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away.
Why the Test is Performed
This test may be performed if:
- You have or are at risk for type 1 diabetes.
- You appear to have an allergic response to insulin.
- Insulin no longer seems to control your diabetes.
- You are taking insulin to control your diabetes and your blood sugar level varies a lot, with both high and low numbers that can't be explained by the food you are eating relative to the timing of your insulin injections.
Normally, there are no antibodies against insulin in your blood. Antibodies can be found in the blood of many people who are taking insulin to control diabetes.
Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your health care provider about the meaning of your specific test results.
What Abnormal Results Mean
If you have IgG and IgM antibodies against insulin, your body reacts as if the insulin in your body is a foreign protein that needs to be removed. This result can be part of the testing that diagnoses you with autoimmune or type 1 diabetes.
If you have diabetes and develop anti-insulin antibodies, this may make insulin less effective, or not effective at all.
This is because the antibody prevents the insulin from working the right way in your cells. As a result, your blood sugar can be unusually high. Many people who are taking insulin to treat their diabetes have detectable antibodies. However, these antibodies do not cause symptoms or change the effectiveness of insulin.
The antibodies can also prolong the effect of insulin by releasing some insulin long after your meal has been absorbed. This can put you at risk for low blood sugar.
If the test shows a high level of IgE antibody against insulin, your body has developed an allergic response to the insulin. This could put you at risk for skin reactions where you inject insulin. You can also develop more severe reactions that affect your blood pressure or breathing.
Other medicines, such as antihistamines or low-dose injectable steroids, may help to lessen the reaction. If reactions have been severe, you may need a treatment process called desensitization or another treatment to remove the antibodies from your blood.
There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Other risks of having blood drawn are slight, but may include:
- Excessive bleeding
- Fainting or feeling lightheaded
- Multiple punctures to locate veins
- Hematoma (blood building up under the skin)
- Infection (a slight risk any time the skin is broken)
Insulin antibodies - serum; Insulin Ab test; Insulin resistance - insulin antibodies; Diabetes - insulin antibodies
Atkinson MA, Mcgill DE, Dassau E, Laffel L. Type 1 diabetes mellitus. In: Melmed S, Auchus RJ, Goldfine AB, Koenig RJ, Rosen CJ, eds. Williams Textbook of Endocrinology. 14th ed. Philadelphia, PA: Elsevier; 2020:chap 36.
Chernecky CC, Berger BJ. Insulin and insulin antibodies - blood. In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures. 6th ed. Philadelphia, PA: Elsevier Saunders; 2013:682-684.
Review Date 1/26/2020
Updated by: Brent Wisse, MD, board certified in Metabolism/Endocrinology, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.