Pulmonary Function Test (Spirometry)


Pulmonary function tests are basically based on numerical evaluation of how many breaths you take and how much of that breath you can take out in a certain time period. These tests are extremely important both in diagnosing and in the follow-up of your asthma. By looking at these values, your doctor will decide on the severity of your disease or the level of control of your asthma.

When are Pulmonary Function Tests done?

  • When you go to the first examination with suspected asthma.
  • When you go to your doctor for a check-up after asthma treatment is started
  • Evaluation of response to treatment when asthma treatment is changed

Pulmonary function tests require good communication and performance. Therefore, it is done from the age of 5-6. For younger children, the condition of the airlines can be evaluated with different methods. The tests are repeated several times. There should be no difference between them.

Things to Do Before Pulmonary Function Test

  • Age, height and body weight are determined.
  • The type, dose and expiration time of the drugs used by the patient, if any, should be known.
  • No smoking and alcohol consumption (at least 24 hours and up to 4 hours before, respectively)
    Do not do heavy exercise
  • Do not wear clothing that restricts your chest and abdominal movements.
  • Don’t be hungry but don’t overeat either
  • Do not use short-acting ß2 agonists
  • Maneuvers to be performed during the test will be explained to you. You can ask questions that you do not understand again.

How are Pulmonary Function Tests Performed?

  • The nose is closed.
  • It should be used for single use in the mouth.
  • Normal breathing is done first.
  • Then take a deep and forceful breath.
  • The command is exhaled quickly and forcefully, without waiting.
  • Thus, it is continued to exhale for at least 6 seconds by forcing.
  • After exhaling, take a deep breath again and the test is terminated.
  • The best out of three consecutive tests is chosen.