Anti-endomysial antibodies (EMA) -— antibodies developed in reaction to the ongoing damage to the intestinal lining; it has been found that tTg is the substance detected in this test. Almost 100% of people with active celiac disease and 70% of those with dermatitis herpetiformis (another gluten-sensitive condition that causes an itchy, burning, blistering rash on the skin) will have the IgA class of anti-EMA antibodies. The test is more difficult to do and interpret properly than anti-tTg so it is used less often.