How is eosinophilic esophagitis diagnosed?

How is eosinophilic esophagitis diagnosed?

Eosinophilic esophagitis is diagnosed by upper endoscopy and biopsy. The endoscopy sometimes reveals rings, white plaques (patches) or grooves in the esophagus.

However, a person can have eosinophilic esophagitis even if the esophagus looks normal. That's why biopsy samples (tissue samples) are taken. Biopsy samples look for an unusually large number of eosinophils in the esophageal tissue. Sometimes several biopsies may need to be taken.