. Bronchial lavage in asthma. A doctor uses an endoscope to collect samples of tissue and fluid from a patient's lungs. The patient is a volunteer with a history of asthma and allergies. In broncho-alveolar lavage, the tip of the endoscope is impacted in a bronchus of the lung. Two or three volumes of saline solution are injected and reaspirated. Smears are made from such bronchial washings and subsequently examined under a microscope to obtain a diagnosis. Photographed at the National Heart and Lung Institute, London. MODEL RELEASED

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