Cytologic diagnosis of Pneumocystis carinii infection by bronchoalveolar lavage in acquired immune deficiency syndrome.

Twenty-six patients with pulmonary infiltrates and suspected acquired immune deficiency syndrome (AIDS) underwent 29 fiberoptic bronchoscopies, including bronchoalveolar lavage. Seventeen of the 18 patients (94.4%) shown to have Pneumocystis carinii pneumonia were diagnosed by examination of the bronchoalveolar lavage specimen. Minor complications occurred in 7 of 29 total bronchoscopies and included transient fever and hypoxemia. Bronchoalveolar lavage is a safe, easy and effective procedure for making the diagnosis of P. carinii pneumonia in patients at high risk for AIDS and should be included routinely when performing fiberoptic bronchoscopy.