TISSUE TRANSGLUTAMINASE (TTG) ANTIBODY, IGA

What this test checks

Detects antibodies against tissue transglutaminase — the most sensitive test for celiac disease.

Why do people get this test?

First-line test in suspected celiac disease.

When you should consider this test

• Chronic diarrhea or unexplained weight loss
• Family history of celiac
• Iron deficiency anemia unresponsive to iron

How to prepare

Continue eating gluten until test is done — going gluten-free first will give false negatives.