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My daughter did blood test for antibodies anti-Transglutaminase (tTG) IgA and/or IgG (which is to determine whether it is Celiac or not) and the doctor never told us that she didn't have to eat anything before the test (she tends to fade). If she ate something with gluten before your blood test, is it possible that it comes out positive even if she's not or viceversa?

 

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People who want to be tested for Celiac should be eating a normal gluten containing diet.  Eating a piece of bread before a Celiac blood test won't make a person who does not have Celiac  test positive.  

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