label: Abnormal bronchoalveolar lavage fluid morphology
label_lc: abnormal bronchoalveolar lavage fluid morphology
description: "Abnormal type or counts of nucleated immune cells and acellular components in bronchoalveolar lavage (BAL) fluid. BAL us performed with a fiberoptic bronchoscope in the wedged position within a selected bronchopulmonary segment. BAL is commonly used to inform the differential diagnosis of interstitial lung disease or to monitor therapeutic interventions."