Diagnosis

To diagnose EoE, when suspected, an esophageal biopsy is performed by an esophagogastroduodenoscopy (EGD), and it is necessary to find 15 eosinophils per high-power field (eos/hpf) at least. However, the identification of which food causes EoE is more difficult. The gold standard remains: an EGD performance eight weeks after an elimination diet to assess the significance of a food allergen in EoE pathogenesis [168,184,185]. The EG diagnosis is made when clinical symptoms sugges<sup>t</sup> it. Then to confirm a positive diagnosis, a biopsy must show eosinophilic inflammation whit 30 eos/hpf in the stomach and 50 eos/hpf in the duodenum [168,186].
