Oximetry Oximetry is a procedure used to measure the oxygen level—or oxygen saturation—in the blood. Pulmonary Function Tests Pulmonary function tests measure how well your lungs are functioning and are used to help diagnose certain lung disorders. Peak Flow Measurement Peak flow measurement is a procedure that records the amount of air flowing out of your lungs. Peak flow can be measured with either a spirometer or a peak flow meter. Bronchodilator Reversibility Testing This test may be done to help your health care provider give you a more accurate prognosis or craft your treatment plan. Chest X-ray A chest X-ray is used to examine the chest and the lungs and other organs and structures located in the chest. Lung Scan A lung scan is a procedure that uses nuclear radiology to assess the function and structure of the lungs. It is most often performed when problems with the lungs and respiratory tract are suspected. Lobectomy A lobectomy is a surgical procedure that removes one of the lobes of the lungs. Lung Transplantation Procedure In a lung transplant, one or both diseased lungs are removed and replaced with a healthy lung from another person. Computed Tomography (CT or CAT) Scan of the Chest CT/CAT scans are more detailed than standard x-rays and are often used to assess the organs of the respiratory and cardiovascular systems, and esophagus, for injuries, abnormalities, or disease.