There are many ways in which cancer can cause fatigue. The growth of a tumor, in general, can be taxing for your body. Other symptoms of cancer such as shortness of breath, anemia, pain, or a decreased level of oxygen in your blood (hypoxia) can cause fatigue.
A pulmonary function test may take 30 to 60 minutes to complete. This will vary according to the amount of trials necessary for you to get repeatable test results.
Typical costs: 1  For patients without insurance, pulmonary function tests typically cost $40-$800 total, depending on how many and which tests are ordered by a physician.  For patients with medical insurance, pulmonary function tests might be covered at 80%-100%. Typically, if a doctor deems a pulmonary function test necessary, the medical insurance provider will cover it.