Description of Test
Most tests will require you to breathe into a mouthpiece. The mouthpiece may be attached to a simple handheld device or be part of a larger machine. Examples of devices are a
peak flow meter. You may be asked to breathe in and out in different patterns and speeds. You will rest between tests.
Tell the technician right away if you have breathing problems, pain, or
Peak Flow Meter
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Other tests that may be used in some situations include:
- A brief period of exercise before the test.
- Oxygen saturation test to measure the amount of oxygen in the blood. Can be measured with a small clip on your finger.
- You may be exposed to a specific chemical called methacholine during the PFT. The test will determine if your breathing changes due to that chemical. This is only done under close and careful supervision.
Rest until you feel able to leave. You may be given medication if testing has caused wheezing, coughing, and/or difficulty breathing.