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What is Pulmonary Function Testing?

Pulmonary Function Tests (PFT's) are noninvasive diagnostic breathing test that provide measurable feedback about the function of your lungs. By assessing lung volumes, capacities, flow rates and gas exchange, PFT's provide information that help diagnose and treat certain lung disorders.

Lung function tests include breathing tests and tests that measure the oxygen level in your blood. The breathing tests most often used are:

  1. Spirometry (spi-ROM-eh-tre). This test measures how much air you can breathe in and out. It also measures how fast you can blow air out.
  2. Body plethysmography (pleth-iz-MOG-ra-fe). This test measures how much air is present in your lungs when you take a deep breath. It also measures how much air remains in your lungs after you breathe out fully.
  3. Lung diffusion capacity. This test measures how well oxygen passes from your lungs to your bloodstream.
How test are performed



Lung volume measurement can be done in two ways:



Things you need to know

