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A pulmonary function test (PFT) is a common, non-invasive way to assess how well your lungs are working. Here is what to expect if your pulmonologist has recommended one.
What Is a Pulmonary Function Test?
A pulmonary function test measures how much air your lungs can hold, how quickly you can move air in and out, and how well your lungs transfer oxygen into your blood. The most common type is spirometry, which involves breathing into a device that measures airflow.
🫁 Lung Capacity
How much air your lungs can hold.
💨 Airflow Speed
How quickly you can exhale air.
📊 Comparison to Expected
Your results are compared to expected values based on age, height and sex.
🔁 Repeat Testing
May be done periodically to track changes over time.
What Happens During the Test?
You will typically be asked to breathe into a mouthpiece connected to a device, following instructions such as breathing in deeply and then exhaling as forcefully and completely as possible. The test is usually repeated a few times to ensure consistent results. It is generally quick, taking about 15-30 minutes, and is not painful.
Preparation tip: your doctor may advise you to avoid certain inhalers, smoking, or heavy meals before the test - follow their specific instructions for the most accurate results.
Why Your Pulmonologist Might Recommend This Test
- To help diagnose conditions like asthma or COPD
- To assess the severity of a known lung condition
- To monitor how a condition is responding to treatment
- As part of a general evaluation for symptoms like breathlessness or chronic cough
United Hospitals' pulmonology team, Jayanagar, offers pulmonary function testing as part of comprehensive respiratory evaluation. Call (+91) 80 4566 6666, or explore our full Pulmonology Care page.
Dr. Mallikarjun
Consultant - Pulmonology and Sleep medicine
Pulmonology & Sleep Medicine · United Hospitals, Jayanagar
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Frequently Asked Questions
Is a pulmonary function test painful?
No, it is a non-invasive test involving breathing into a device. It requires effort but is not painful.
How long does the test take?
A standard pulmonary function test typically takes about 15-30 minutes, including repeated measurements to ensure accuracy.
Do I need to prepare for the test?
Your doctor may give specific instructions, such as avoiding certain inhalers or smoking beforehand. Follow their guidance for the most accurate results.
What can this test help diagnose?
Pulmonary function tests can help diagnose and assess conditions such as asthma, COPD, and other conditions affecting lung function.
United Hospitals - Pulmonology & Sleep Medicine, Jayanagar
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