If your doctor suspects that you have coeliac disease, the first step in the diagnosis process is to undertake a simple blood test to screen for coeliac antibodies.
If the result is positive for coeliac antibodies, the next stage of the diagnosis process is to be referred to a gastroenterologist for a further test, known as a biopsy. A biopsy takes a small tissue sample from the lining of your small intestine, which the gastroenterologist will view under a microscope. They will then be able to determine whether your villi looks normal, or shows signs of coeliac disease.
Please note, it is important to continue on a gluten containing diet prior to and during the tests for diagnosis of coeliac disease to ensure that all test results are accurate and diagnosis is confirmed or excluded. If you have removed gluten from your diet beforehand consult your doctor for advice about reintroducing gluten to be tested.