please read up and do some research. My mum and grandmother have Celiac Disease. It is very different to just a food intolerance. My mum was very ill as a child and even now associates foods such as pasta and spaghetti will illness and will not eat gluten free pasta. As far as I know, the only genuine test for Celiac Disease is a biopsy of the small intestine. A blood test does not make sense to me, as Celiac Disease affects the small intestine and not blood. Both my mum and grandmother were diagnosed by having the biopsy.
True Celiac Disease is a type of auto immune disease where the body has an inability to process gluten. Gluten is present in wheat, oats, barely and rye so the person eliminates all forms of these grains from their diet.
Source
https://www.mayoclinic.org/diseases-conditions/celiac-disease/symptoms-causes/syc-20352220
Eating gluten triggers an immune response in the small intestine. Over time, this reaction damages the small intestine's lining and prevents absorption of some nutrients (malabsorption). The intestinal damage often causes diarrhea, fatigue, weight loss, bloating and anemia, and can lead to serious complications.
In children, malabsorption can affect growth and development, in addition to the symptoms seen in adults.