Solvent Interactions and Staining Theory
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Bronchoalveolar lavage (BAL) is the most useful technique for diagnosing Pneumocystis jirovecii pneumonia (PJP). BAL samples the alveolar spaces where the organism resides and yields adequate material for cytological examination. PJP appears as frothy, eosinophilic alveolar casts containing cup-shaped cysts and trophozoites. Special stains like methenamine silver, Giemsa, or immunofluorescence are used to highlight the organisms. While induced sputum can sometimes detect PJP, BAL has higher sensitivity, especially in patients with mild disease or those who cannot produce adequate sputum.
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