A blood test can be done to detect high levels of antibodies that would be present if you have coeliac disease. If the results are negative, but you still have symptoms suggestive of coeliac disease, further testing may be required. If the results are positive then this would need to be confirmed with a biopsy.
A biopsy of the small intestine can confirm the findings of a blood test. An endoscope is placed through the mouth and stomach into the small intestine and a small amount of tissue is removed. This will show whether the lining of the small intestine has been damaged.