Pulmonary Function Lab Pulmonary function tests allow pulmonologists to test a child’s lung health. Connecticut Children’s pulmonary function laboratory uses several leading diagnostic testing methods to care for children w ith an array of pulmonary disorders, including asthma and cystic fibrosis. Spirometry Body plethysmography testing Impedance oscillometry Methacholine challenge Cardiorespiratory adaptation Exercise provocation Spirometry is the most common pulmonary function test, although the recommended test will depend on your child’s age and overall health. While these tests can help your care team get a better sense of your child’s lung health, it is just one piece of the puzzle. A child’s medical history, physical exam and other tests such as cultures, X-rays or lab work are all taken into consideration when pulmonary function test results are reviewed.