Bronchoalveolar lavage findings of leukocytes support which diagnosis?

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Bronchoalveolar lavage findings of leukocytes support which diagnosis?

Bronchoalveolar lavage reveals the type of inflammatory cells accumulating in the airspaces, which helps distinguish interstitial lung diseases. In hypersensitivity pneumonitis, the lavage shows a lymphocyte-predominant alveolitis—many lymphocytes in the lavage fluid, often with a relatively low CD4/CD8 ratio (CD8-predominant). This pattern reflects an immune-mediated reaction to inhaled antigens and is a characteristic finding supporting hypersensitivity pneumonitis. This is not how the other conditions usually present on lavage. Pneumoconiosis tends to show macrophage-dominated cellularity with particles and dust-laden macrophages. Pulmonary edema can show neutrophils or mixed cells related to fluid overload, but the hallmark lymphocytic alveolitis points toward hypersensitivity pneumonitis. Pneumonitis is a broad term, but the specific BAL pattern of lymphocytosis aligns with hypersensitivity pneumonitis.

Bronchoalveolar lavage reveals the type of inflammatory cells accumulating in the airspaces, which helps distinguish interstitial lung diseases. In hypersensitivity pneumonitis, the lavage shows a lymphocyte-predominant alveolitis—many lymphocytes in the lavage fluid, often with a relatively low CD4/CD8 ratio (CD8-predominant). This pattern reflects an immune-mediated reaction to inhaled antigens and is a characteristic finding supporting hypersensitivity pneumonitis.

This is not how the other conditions usually present on lavage. Pneumoconiosis tends to show macrophage-dominated cellularity with particles and dust-laden macrophages. Pulmonary edema can show neutrophils or mixed cells related to fluid overload, but the hallmark lymphocytic alveolitis points toward hypersensitivity pneumonitis. Pneumonitis is a broad term, but the specific BAL pattern of lymphocytosis aligns with hypersensitivity pneumonitis.

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