Introduction: Health RelatedQuality of Life (QOL) is an important outcome in the assessment of the affects of disease on patients. Global QOL instruments are often too broad to accurately evaluate specific disease states. Eosinophilic esophagitis (EoE) is an increasingly recognized disease associated with significant morbidity. The EoE-QOL-A is a reliable and valid, 5scale 37-item instrument to evaluate QOL in adults with EoE. We sought to confirm its construct validity and acceptability via qualitative cognitive interviews and item refinement. Methods: EoE patients aged 19-69 were recruited via both a university-based outpatient GI clinic and laboratory. EoE was defined based on recent consensus recommendation guidelines. Patients underwent structured cognitive interviews about the EoE-QOL-A to assess clarity, understandability, length, rhetoric, and potential variability in interpretation for each question. Patient responses were reviewed by 3 gastroenterologists, 2 clinical psychologists, and a medical student to appropriately refine the original survey items and format. Results: 10 patients were interviewed; Mean±SD age was 33.8±15.0 yrs; 90% of patients were Caucasian; 90% college-educated. Patients had EoE for 12.9±12.5 yrs. In the past 7 days, patients rated their EoE symptom severity as a 2.6±.90 (5 point global severity score), and rated overall impact of EoE on their daily life at 3.5±.76 (5 point scale). 60% were currently being treated with steroids and/or dietary therapies; 50% used oral/inhaled steroids, 20% used elimination diet therapies. Based on interview data, 7 questions were deleted because of nearly unanimous agreement in lack of clarity, relevance and/or repetitiveness with other questions within the survey. 8 questions were re-phrased to alleviate leading rhetoric and/or ambiguity in wording that led to extensive variability in interpretation. 6 questions were entirely separated for only patients on elimination diet therapies as the 80% of patients not on such therapies found these questions to be irrelevant or not applicable. The final measure was reduced from 37 to 24 items with a 6-question addendum for those on the elimination diet therapies. Conclusions: The final stage of patient reported outcome (PRO) validation of the EoE-QOL-A by means of cognitive interviews of adults with EoE led to a refined, 30-item scale. The measure meets the recommended guidelines for PRO development, allowing for assessment of the impact of EoE on adult patients across multiple domains in both research and clinical settings.