Histologic confirmation is esophageal mucosal eosinophilia
#eosinophilic_esophagitis
Note: peak density ≥15 eosinophils per high-power field
Ref:
Harrison
[ 2217]
Epocrates
[ https://online.epocrates.com/diseases/130431/Eosinophilic-esophagitis/Diagnostic-Approach]