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
