Cancer Information  lung function test  (… FUNK-shun …)  A test
used to measure how well the lungs work. It measures how much
air the lungs can hold and how quickly air is moved into and out
of the lungs. It also measures how much oxygen is used and how
much carbon dioxide is given off during breathing. A lung
function test can be used to diagnose a lung disease and to see
how well treatment for the disease is working. Also called PFT
and pulmonary function test.