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Background: Clinicians typically estimate heart failure health status using the New York Heart Association Class, which is often discordant with patient-reported health status. It is unknown whether collecting patient-reported health status improves the accuracy of clinician assessments. Methods: The PRO-HF trial (Patient-Reported Outcomes in Heart Failure Clinic) is a randomized, nonblinded trial evaluating routine Kansas City Cardiomyopathy Questionnaire-12 (KCCQ-12) collection in heart failure clinic. Patients with a scheduled visit to Stanford heart failure clinic between August 30, 2021 and June 30, 2022 were enrolled and randomized to KCCQ-12 assessment or usual care. In this prespecified substudy, we evaluated whether access to the KCCQ-12 improved the accuracy of clinicians' New York Heart Association assessment or patients' perspectives on their clinician interaction. We surveyed clinicians regarding their patients' New York Heart Association Class, quality of life, and symptom frequency. Clinician responses were compared with patients' KCCQ-12 responses. We surveyed patients regarding their clinician interactions. Results: Of the 1248 enrolled patients, 1051 (84.2%) attended a visit during the substudy. KCCQ-12 results were given to the clinicians treating the 528 patients in the KCCQ-12 arm; the 523 patients in the usual care arm completed the KCCQ-12 without the results being shared. The correlation between New York Heart Association Class and KCCQ-12 Overall Summary Score was stronger when clinicians had access to the KCCQ-12 (r=−0.73 versus r=−0.61, P <0.001). More patients in the KCCQ-12 arm strongly agreed that their clinician understood their symptoms (95.2% versus 89.7% of respondents [odds ratio‚ 2.27; 95% CI‚ 1.32–3.87]). However, patients in both arms reported similar quality of clinician communication and therapeutic alliance. Conclusions: Collecting the KCCQ-12 in heart failure clinic improved clinicians' accuracy of health status assessment; correspondingly, patients believed their clinicians better understood their symptoms. Registration: URL: https://www.clinicaltrials.gov; Unique identifier: NCT04164004. [ABSTRACT FROM AUTHOR]