Pulmonary Exercise testing is indicated to evaluate unexplained or exercise-induced dyspnea. It will help determine whether exertional limitations are primarily cardiovascular or pulmonary in nature, document exercise-induced hypoxemia, detect covert respiratory dysfunction in patients with interstitial or pulmonary vascular disease, assess response to treatment, assess athletic training programs, and assess presurgical risk for pulmonary resection. Pulse Oximetry is a procedure, which measures the oxygen level in your blood, without having to take a blood sample, on a continuous basis. A painless clip is placed on your fingertip or ear lobe, while the respiratory therapist monitors the reading on a device called a pulse oximeter. The reading may be monitored for several minutes while you are seated at rest to evaluate your oxygen level without supplemental oxygen. Then, if needed, supplemental oxygen may be provided by means of a nasal cannula. The amount delivered will be adjusted to bring you to the level your physician has ordered. 6 Minute Walk Test: The respiratory therapist will instruct and observe while you walk with the sensor clip in place to observe your response to exertion(measure the distance a patient can walk in 6 minutes) and measuring the distance you have walked. You will walk at your own pace. If your oxygen level decreases, you may be asked to repeat the test with supplemental oxygen increased to the next setting. This process may be repeated several times, until your oxygen level is adequate. Pulmonary Function Laboratory: Pulse Oximetry or 6 Minute Walk Test