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OVERDIAGNOSIS OF COELIAC DISEASE IN A PATIENT WITH ASCARIASIS AND GIARDIASIS. There are many errors in the diagnosis of celiac disease. The most common errors are following: underestimation of the importance of comprehensive laboratory and instrumental studies (histological study of biopsy specimens of the duodenal mucosa, molecular- genetic HLA typing and serological markers of celiac disease); the positive clinical dynamics after a strict gluten-free diet is not always confirm the diagnosis of celiac disease; insufficient or incorrect orientation of biopsy specimens of the mucous of the duodenum; illiterate description and interpretation of histopathological data; neglecting to identify possible IgA deficiency, the use of serological tests with low specificity for the diagnosis of celiac disease.