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Brochoalveolar lavage

Drawing of cellular material from the lung which is derived from the small airways and approximately 1 million alveoli.

Useful in the diagnosis of pulmonary alveolar proteinosis, diffuse alveolar hemorrhage, opportunistic infections and malignancies.

Usually cells seen in such specimens are 85-93% macrophages, 10% lymphocytes and less than 2% are neutrophils and eosinophils.

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