Normal values are calculated based on age, height and gender. If a value is abnormal, a lung problem may be present. Sometimes a patient with normal lungs may have a breathing test value that is abnormal. Your doctor will explain what your test results mean. Depending on the results of the test, your doctor may prescribe inhalers or medicines to help improve your lung function. The testing may be repeated at future visits to monitor your lung function.
The technician may give you a medicine to help open your airways and then repeat the test to see if your breathing improves with the medicine. The testing takes about 30 to 45 minutes.