commercial, CLIA-approved, laboratory-developed test known as the Esophageal String Test™ (EST). The EST provides a quantitative measure of the likelihood of active disease in a patient, which the clinician uses along with other information to guide therapy, develop food-elimination plans, and in general get a far better understanding of the disease and its inflammatory triggers. Together, this provides a validated, quantitative alternative to endoscopy/biopsy for monitoring EoE patients.