The normal ranges for pulmonary function tests vary by test type, according to the American Academy of Family Physicians. Some normal ranges are values between 80 and 120 percent for the FEV1 test, and values between 80 and 120 percent for the FVC. There are seven tests in total.
Additional normal pulmonary function test values are values within 5 percent of the predicted ratio for the absolute FEV1 /FVC ratio test, states the AFP. Pulmonary function tests are a function of spirometry, an evaluative tool physicians use to aid patients with lung disorders. The most important pulmonary function test is the FVC test.