ATS GUIDELINES Bundle

Hypersensitivity Pneumonitis in Adults

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22 Diagnosis Figure 6. Hypersensitivity Pneumonitis Diagnosis Based on Incorporation of Imaging, Exposure Assessment, BAL lymphocytosis, and Histopathological Findings Typical for HP HP= hypersensitivity pneumonitis; HRCT= high-resolution computed tomography. Exposure – Low confidence High confidence Definite Moderate confidence High confidence Exposure + Moderate confidence Definite Definite High confidence Definite History of exposure and/or serum IgG testing No BAL or BAL without lymphocytosis and either no histopathology or indeterminate histopathology BAL lymphocytosis with indeterminate histopathology Typical HP histopathology BAL lymphocytosis without histopathology sampling Probable HP histopathology

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