priligy in usa A an intestinal biopsy revealing subtotal atrophy of the villi in a patient on an average diet proves celiac disease B a gluten free diet is introduced following the detection of subtotal atrophy of the villi, and a biopsy is repeated 2 months following the relief of symptoms; if the histology is still abnormal, then celiac disease is excluded C a xylose absorption test is necessary for the diagnosis D the diagnosis is only reliable if the biopsy is repeated 1 year after the restriction of gluten and the histology is normal and then, 6 months after the re introduction of gluten, the biopsy preparation reveals the characteristic abnormalities again PED 138