Gluten Immunoglobulin G (IgG) Antibody Test (Serum)

Your doctor may order this blood test to help determine whether your symptoms are caused by celiac disease or another immune reaction to gluten. It measures IgG antibodies, which your immune system may produce when it reacts to gluten, and it can be especially helpful if other celiac screening results were unclear or if you have low IgA levels.

Your doctor may recommend this test if you have symptoms like persistent stomach pain, bloating, diarrhea, or unexplained weight loss. It may also be used as part of a screening process for conditions linked to gluten exposure, such as celiac disease or non-celiac gluten sensitivity.

A health professional draws a small sample of blood from a vein, usually in your arm, and sends it to a laboratory. There, the sample is analyzed for IgG antibodies, proteins made by your immune system in response to gluten. If these antibodies are found at higher levels, it may suggest that your body is mounting an immune reaction to the gluten in foods you eat.

A small blood sample is taken from a vein in your arm. The serum portion of your blood is then analyzed to detect the presence of IgG antibodies specific to gluten. This process typically involves an immunoassay method to measure antibody levels accurately.

No special preparation is usually required, but it is important to keep eating foods that contain gluten before the test unless your doctor tells you otherwise, because avoiding gluten can lower antibody levels and make the results harder to interpret. Also let your care team know about any medications, supplements, or recent illnesses you have had.

No special preparation is usually needed for this test. However, if you are taking medications or supplements, inform your healthcare provider beforehand. Avoiding gluten-heavy foods for a few days before testing may not be necessary unless advised by your doctor.

Your report will show an antibody level along with a reference range. A higher-than-normal level may suggest celiac disease or another gluten-related condition, but it does not confirm a diagnosis by itself, so your doctor may recommend additional testing such as an intestinal biopsy. A result within the normal range makes celiac disease less likely, though your symptoms will still be taken into account.

Results are not provided with specific numeric ranges. Elevated IgG antibody levels may suggest an immune response to gluten, but they alone do not confirm celiac disease. Your doctor will interpret the results in the context of your symptoms and other tests.