This document provides information on various diagnostic procedures and exams related to the respiratory system, including: - Chest x-ray to examine the lungs - Sputum specimen collection to identify organisms or abnormal cells - Suctioning procedure for sputum collection - Bronchoscopy for direct visual exam of airways - Pulmonary angiography using catheter and contrast dye - Thoracentesis for fluid or air removal from pleural space - Lung biopsy to obtain tissue for analysis - Ventilation/perfusion lung scan to evaluate blood flow and ventilation - Skin testing using intradermal injection to diagnose infections - Arterial blood gas measurement to assess acid-base state and oxygen carriage - Pulse