Question: I took a blood test for celiac disease, which came back negative. But I didn’t fast before the test, nor was I told to do so. Should I have fasted?

Dr. Hibberd's answer:
You must be on your regular diet before the test. If not, the results could be wrong. Because the blood tests are not 100 percent accurate, anyone with a negative test result and symptoms suggestive of celiac disease should also consider talking to a doctor regarding an upper endoscopy and intestinal biopsy. Celiac (pronounced SEE-lee-ak) disease is a digestive condition triggered by the protein gluten, which is found in foods containing wheat, barley, or rye.