https://medlineplus.gov/lab-tests/lung-function-tests/
Lung Function Tests: MedlinePlus Medical Test
Lung function tests show how well your lungs work. They help diagnose and monitor diseases that affect breathing. Learn more.
lung function testsmedlineplusmedical
https://www.lung.org/lung-health-diseases/lung-procedures-and-tests/lung-function-tests
Pulmonary Function Tests | American Lung Association
Lung function tests (or pulmonary function tests) include a variety of tests that check how well the lungs work.
pulmonary function testsamerican lung association