question: Celiac Disease (What tests do doctors use to diagnose celiac disease?): A health care professional may take a blood sample from you and send the sample to a lab to test for antibodies common in celiac disease. If blood test results are negative and your doctor still suspects celiac disease, he or she may order more blood tests.If a biopsy and other blood tests do not clearly confirm celiac disease, your doctor may order genetic blood tests to check for certain gene changes, or variants.4 You are very unlikely to have celiac disease if these gene variants are not present. Having these variants alone is not enough to diagnose celiac disease because they also are common in people without the disease. In fact, most people with these genes will never get celiac disease.If blood tests suggest you have celiac disease, your doctor will perform a biopsy to be sure. During a biopsy, the doctor takes a small piece of tissue from your small intestine during a procedure called an upper GI endoscopy.If a doctor suspects you have dermatitis herpetiformis, he or she will perform a skin biopsy. For a skin biopsy, the doctor removes tiny pieces of skin tissue to examine with a microscope.A doctor examines the skin tissue and checks the tissue for antibodies common in celiac disease. If the skin tissue has the antibodies, a doctor will perform blood tests to confirm celiac disease. If the skin biopsy and blood tests both suggest celiac disease, you may not need an intestinal biopsy.