<unk>  is a procedure in which cells are taken from the inside of the airway mucosa or<unk>  lesions through catheter-based<unk>  under direct visualization or fluoroscopic guidance. Flexible brushes are passed through the bronchoscope, and the<unk>  surface is gently abraded to obtain the specimen. Various types of<unk>  brush may be used to collect both cellular and microbiological material, using direct vision when collecting from proximal areas of suspicion or fluoroscopic screening when sampling more peripheral sites. A<unk>  is used to find cancer and changes in cells that may lead to cancer. It can also be used to obtain specimens for microbiologic diagnosis.
Bronchial brushing
Lung biopsy
Bronchial challenge test
Bronchoscopy
Bronchography
Bronchoalveolar lavage
Electromagnetic navigation bronchoscopy
Post bronchodilator test