Assists in the diagnosis, treatment, and management of patients with pulmonary disorders. Collects and analyzes sputum, blood, and breath specimens to determine levels of oxygen, carbon dioxide, and other gases. Also measures the lung capacity of a patient to determine if there is impaired function. Administers treatment prescribed by a physician for the care of patients with abnormalities associated with the breathing process. Assumes primary responsibility for respiratory care treatments, including oversight of respiratory therapy technicians.