To diagnose asthma or other lung problems, your doctor may perform lung function or pulmonary function tests. WebMD explains spirometry, the methacholine challenge test, and other exams to check ...

How well your lungs function may predict how long you live, according to a nearly 30-year follow-up of the association between impaired pulmonary function and all causes of mortality conducted by ...

Liver function tests can help doctors determine whether a person has liver damage and what might be causing it. Learn about the tests and what the results mean here.