If you or a loved one has been diagnosed with asthma, your doctor may recommend a pulmonary function test (PFT) to assess lung health. This test helps determine how well your lungs are working and guides treatment options. Knowing what to expect during the test can help reduce anxiety and ensure you are prepared.

What Is an Asthma Pulmonary Function Test?

An asthma pulmonary function test is a series of non-invasive tests that measure how much air you can inhale and exhale, and how quickly you can do so. These measurements help identify airway obstruction typical in asthma and evaluate its severity.

Preparation for the Test

Before the test, your healthcare provider may give you specific instructions. Generally, you should:

  • Avoid smoking for at least an hour before the test.
  • Refrain from using bronchodilator inhalers unless instructed otherwise.
  • Wear comfortable clothing that allows easy breathing.
  • Inform the technician about any recent respiratory infections or medications.

What Happens During the Test?

The test typically takes about 30 minutes and involves several steps performed by a trained technician:

  • Breathing into a device: You will breathe into a mouthpiece connected to a spirometer, which measures airflow and lung volume.
  • Repeated efforts: You will perform multiple inhalation and exhalation maneuvers to ensure accurate readings.
  • Bronchodilator test (if needed): Sometimes, a medication is administered to see how your lungs respond, helping distinguish asthma from other lung conditions.

What Should You Expect During the Procedure?

During the test, you will be asked to sit upright and breathe through the mouthpiece. You may be asked to breathe normally, then forcefully blow out as hard as possible. The technician will guide you through each step and monitor your comfort.

The test is generally safe, but you might experience some lightheadedness or shortness of breath temporarily. If you feel uncomfortable, inform the technician immediately.

After the Test

Once completed, you can resume your normal activities. The healthcare provider will analyze the results and discuss them with you. Based on the findings, they may adjust your treatment plan or recommend additional tests.

Understanding what to expect can make your pulmonary function test a less stressful experience. Remember to follow any pre-test instructions provided by your healthcare team for the most accurate results.