Diagnosing coeliac disease in children is best started with genetic tests. These are even recommended by the European Society for Paediatric Gastroenterology, Hepatology and Nutrition (or ESPGHTN N). The reason is very simple - it is a very effective method of diagnosing coeliac disease. Besides, genetic testing avoids the need for a small bowel biopsy, which usually causes a lot of concern among both children and parents.