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Anti-transglutaminase antibodies (ATA) are autoantibodies against the transglutaminase protein. Detection is considered abnormal, and may indicate one of several conditions . Antibodies serve an important role in the immune system by detecting cells and substances that the rest of the immune system then eliminates.
Serology for anti-tTG antibodies has superseded older serological tests (anti-endomysium, anti-gliadin, and anti-reticulin) and has a strong sensitivity (99%) and specificity (>90%) for identifying celiac disease. Modern anti-tTG assays rely on a human recombinant protein as an antigen. [43]
The IgG antibody is similar to AGA IgA, but is found at higher levels in patients with the IgA-less phenotype. It is also associated with coeliac disease and non-celiac gluten sensitivity. [5] [6] [7] Anti-gliadin antibodies are frequently found with anti-transglutaminase antibodies.
References range may vary with age, sex, race, pregnancy, [10] diet, use of prescribed or herbal drugs and stress. Reference ranges often depend on the analytical method used, for reasons such as inaccuracy, lack of standardisation, lack of certified reference material and differing antibody reactivity. [11]
Anti-enterocyte antibodies Probable Rare [24] Autoimmune hepatitis: Liver: ANA, ASMA, anti-LKM1 Confirmed 1 in 10,000 to 1 in 50,000 [25] Celiac disease: Small intestine: Anti-tissue transglutaminase antibodies (tTG), Endomysial antibody (EMA), Deamidated gliadin peptide (DGP) Confirmed 1 in 100 [26] Crohn's disease: Digestive tract
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Anti-endomysial antibodies (EMA) are present in celiac disease. [8] They do not cause any direct symptoms to muscles, but detection of EMA is useful in the diagnosis of the disease. [ 9 ]
Tests for the antibodies in the blood can be used clinically to help screen for celiac disease, IgA blood tests for both tTG and endomysial tTG can be effective ways to determine whether someone has Celiac disease, especially in more severe cases, although for more common, mild forms of Celiac, these tests are less effective.