A correct diagnosis of celiac disease is very important. Testing options include a blood test or an endoscopy. A blood test is the most common test because it is easy and can provide a clear answer.

Celiac disease was noted as an indication for endoscopy in 11% of patients where ... the likelihood of findings consistent with CD was significantly higher in this group when compared to patients ...

small bowel Crohn's disease and small bowel malignancy. Intraoperative endoscopy can also be used as a method for diagnosis if VCE fails, or as a therapeutic procedure for the findings of VCE.