For the doctor to monitor your disease it is to be ensured on your part that you must pay regular visits to your doctor since monitoring is a year-long procedure. This way, the doctor will be able to confirm whether the treatment being given is effective or not. For this you are supposed to go through various tests like pulmonary function tests, CT scans etc. A pulmonary function test measures the efficacy of the functioning of the lungs and X-rays are used to determine the location and extent of the disease. He may also suggest you a six-minute walk to determine the disease.