by
mohit bohra
| Apr 14, 2025
Updated on - 05 Jan 2026
Healthy lungs are important for delivering oxygen to the body and removing carbon dioxide, which keeps all organs functioning properly. To ensure the lungs are working efficiently, doctors use pulmonary function tests (PFTs), which assess how well the lungs perform these essential tasks. These tests are particularly important for identifying respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD) and pulmonary fibrosis before they progress.
In addition, PFTs allow healthcare providers to track changes in lung function over time and determine whether treatments are effectively improving respiratory health. Let’s take a closer look at the purpose, different types and key benefits of PFT tests.
PFT test meaning
A pulmonary function test (PFT) is a non-invasive procedure that measures various aspects of lung performance. It evaluates lung volumes, airflow and the efficiency of gas exchange, providing detailed insights into how the lungs respond during different activities. PFTs can also help identify patterns of lung impairment, distinguish between obstructive and restrictive conditions and assess the impact of environmental or occupational exposures. This information helps doctors understand the type of lung problem and decide the best treatment for each person.
Types of pulmonary function tests
Here are the different types of pulmonary tests performed to determine your health status:
1. Spirometry
The patient must breathe into a mouthpiece connected to a machine called a spirometer. It measures the amount breathed in and out, as well as breathing speed. This lung function test helps measure the efficiency and capacity of the lung airways.
2. Plethysmography
In this test, the patient is made to sit or stand in an airtight box. The box records the measurements of air volumes in the lungs after a deep inspiration and the amount left behind after a complete exhalation, giving a reading concerning the total lung capacity.
3. Diffusion capacity tests
Diffusion capacity tests measure how efficiently gases, such as oxygen, move from the lungs into the bloodstream. These tests are important for evaluating overall lung function and can help detect conditions that affect the lung’s gas exchange, such as pulmonary fibrosis, emphysema or other interstitial lung diseases.
4. Cardiopulmonary exercise tests
The test determines how well your lungs function when active. You may be asked to walk for a few minutes. Afterwards, the healthcare professional monitors the oxygen level you require for this activity and the distance you can cover in that specific time.
Why is a PFT test done?
There can be several reasons a healthcare professional may advise you to take PFT tests. Sometimes it is a part of the routine, while other times it is used to diagnose the cause of your lung-related symptoms. The reasons include:
- Asthma
- Work environment, like coal mines and graphite factories
- Lung infection
- Breathlessness
- Long-term lung conditions, like bronchitis and emphysema
- Disease caused due to inhaling asbestos fibres
- Airway problems like inflammation or lung scarring
- Sarcoidosis
- Scleroderma
At times, PFT is also conducted before a surgery or a lung-related routine procedure.
Conditions detected by PFT tests
PFT is used to assess several respiratory ailments and detect the following conditions in a patient:
1. Asthma
The test identifies obstruction in reversible airflow, i.e., asthma. This medical condition may make it tough for you to breath and lead to problems like cough, chest tightness and wheezing.
2. COPD
Chronic obstructive pulmonary disease occurs when the airway or lungs are damaged, making it tough for you to breath. This problem can lead to chronic bronchitis or emphysema.
3. Bronchiectasis
The airway is stretched or widened, leading to bronchiectasis. Healthcare professionals perform PFT tests to diagnose this problem.
4. Sarcoidosis
It is an inflammatory disease where granular lumps form in the lungs or lymph nodes. This formation interferes with the normal functioning of the organs.
5. Pulmonary fibrosis
Your lungs are scarred, making it difficult for them to expand. Ultimately, your body doesn’t get enough oxygen and can become adverse over time.
6. Lung damage
PFT can assess if your lungs are affected due to work conditions or exposure to certain chemicals.
Does health insurance cover pulmonary tests and treatment?
Most health insurance policies may cover pulmonary function tests if they are recommended by a doctor. Plans such as critical illness insurance could cover related treatments if the condition falls under the policy terms. It is important to review your policy carefully to understand coverage details, waiting periods and exclusions, so you can plan for any necessary medical expenses.
Conclusion
Pulmonary function tests are generally performed when you have airway or lung-related symptoms like chest tightness, coughing, shortness of breath or wheezing. The professional may advise you to undergo a PFT test even if you have no symptoms. It can be a part of your regular health check-up. Therefore, it is advisable to get a comprehensive medical insurance that covers basic tests like the PFT.
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FAQs
1. Are PFT tests safe?
PFTs are generally safe, but you may feel dizzy or lightheaded due to deep breathing. These side effects are expected to go away shortly after the test.
2. How is a PFT test performed?
The test is relatively simple, and consists of a clear airtight box, a mouthpiece, soft nose clips and an electronic machine to measure the airflow.
3. What happens during a PFT test?
During a PFT, you breathe into a mouthpiece connected to a machine. The test measures how much air you can inhale and exhale, how fast you breathe and how well your lungs transfer oxygen to your blood.
4. What are the risks associated with the PFT?
Pulmonary function tests are generally safe. Some people may feel lightheaded, cough or feel short of breath during the test. Serious complications are very rare.
5. What is the normal range of a pulmonary function test?
The normal range for a PFT is that the (Forced Expiratory Volume in 1 second) FEV1 and FVC (Forced Vital Capacity) should be 80% or more.
Disclaimer: The information provided in this blog is for educational and informational purposes only. It is not intended as a substitute for professional advice, diagnosis or treatment. Please consult your general physician or another certified medical professional for any questions regarding a medical condition. Relying on any information provided in this blog is solely at your own risk, and ICICI Lombard is not responsible for any effects or consequences resulting from the use of the information shared.