Hypersensitivity pneumonitis diagnosis

Hypersensitivity pneumonitis diagnosis based on incorporation of imaging, exposure assessment, BAL lymphocytosis, and histopathological findings. All confidence levels are subject to multidisciplinary discussion.

HRCT: high resolution computed tomography; HP: hypersensitivity pneumonitis; BAL: bronchoalveolar lavage.
* Confidence may increase to "definite" if the pathologist's conclusion persists after reevaluation in the context of additional clinical information or an expert second opinion on histopathology.

Reprinted with permission of the American Thoracic Society. Copyright © 2020 American Thoracic Society. All rights reserved. From: Raghu G, Remy-Jardin M, Ryerson CJ, et al. Diagnosis of Hypersensitivity Pneumonitis in Adults. An Official ATS/JRS/ALAT Clinical Practice Guideline. Am J Respir Crit Care Med 2020; 202:e36. The American Journal of Respiratory and Critical Care Medicine is an official journal of the American Thoracic Society.

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Hypersensitivity pneumonitis diagnosis