Pulmonary Function Test (PFT)

Pulmonary Function Test (PFT)

PFT is an acronym for Pulmonary function tests. It is an array of non-invasive diagnostic tests that are performed to evaluate the functions of the lungs. The tests measure the capacity of lungs, volume, rate of flow, and gas exchange. The PFT tests make doctors enable to prepare an effective...

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PFT is an acronym for Pulmonary function tests. It is an array of non-invasive diagnostic tests that are performed to evaluate the functions of the lungs. The tests measure the capacity of lungs, volume, rate of flow, and gas exchange. The PFT tests make doctors enable to prepare an effective and customized treatment plan for various kinds of lung disorders and illnesses. These tests can easily detect a variety of lung disorders with a different sets of symptoms.

Types of Pulmonary Function Tests

Pulmonary function tests are of 8 types.

  • Spirometry: This type of test is one of the most frequently used lung tests, which measures the quantity of air inhaled and exhaled. It also evaluates how quickly the lungs push the air out.
  • Body plethysmography: This test measures the amount of air left in the lungs after exhalation. For this test, to measure the amount of air in the lungs, you require to take a deep breath.
  • Lung diffusion capacity: This test is used to evaluate how thoroughly the air goes from your lungs and into the bloodstream. 
  • Bronchial provocation test: This test is performed specifically to diagnose the problems like asthma and its severity. It checks the airways to determine how narrow they get during an asthma attack.
  • Cardiopulmonary exercise stress test: This is a dual-purpose lung test that evaluates the strength of the lungs as well as the heart. It is usually recommended for people with heart diseases or lung’s related issues.
  • Pulse oximetry test: This blood test is conducted to measure the level of oxygen in the blood
  • Arterial blood gas test: This blood test is performed to check the level of oxygen and carbon dioxide in the body.
  • Fractional exhaled nitric oxide test: The nitric oxide levels in the body can lead to rising because of a variety of asthmatic conditions. This test is performed to measure the amount of nitric oxide gas present in the exhaled breath.

Why is it done?

  1. To detect lung cancer
  2. To detect asthma problem
  3. To detect COPD
  4. To detect allergies
  5. To detect lung infection

What is the procedure for Pulmonary Function Test?

Every PFT test is performed to assess various factors, Hence the procedure for every test is different.

A radiologist will explain.

How does one prepare for the test?

  1. Before the procedure, you need to empty your bladder.
  2. You will sit in a chair and a soft clip will be put on your nose so that all of your breathing is done through your mouth.
  3. A sterile mouthpiece will be given to you and that is attached to a spirometer.
  4. To inhale and exhale in different ways, multiple techniques will be used.
  5. After certain tests, you may be given a bronchodilator and the tests will then be repeated several minutes later after the bronchodilator has taken effect.


After Care

No care is required.

The price of a Pulmonary Function Test in Delhi

The Pulmonary Function Test(PFT) price is Rs. 3000

Test Type Pulmonary Function Test (PFT)

Pulmonary Function Test (PFT)


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Test Price ₹ 2400 ₹ 3000
Frequently Asked Questions

The Spirometry is considered to be a type of lung function test that would measure how much air you could breathe out.

It also helps in measuring how fast you can blow air out. During the test, the technician would ask you to take a deep breath in. Then, you would ask to blow as hard into the tube connected to small machine.

There are certain things that can make the PFTs less accurate.

These include the following:

  • Not be able to follow the instructions for doing this test.
  • For example- using medicines that open the airways (bronchodilators)

Before The Test

  • You are expected to not eat, not smoke, or exercise for around 4-8 hours before the testing.
  • You are requested to wear loose-fitting clothing.

Most important values of PFT are as follows:

  • Forced Vital Capacity (FVC)
  • Forced Expiratory Volume In One Second (FEV1),
  • FEV1/FVC Ratio

The Spirometry is not able to measure your residual volume or total lung capacity.

The PFTs are used in diagnoses of a lung condition if the patients experience symptoms such as the following:

  • Shortness of Breath - Dyspnea

PFTs might used to diagnose or help in the following:

  • Treat Lung Diseases e.g. Cystic Fibrosis
  • Lung Damage Due To The Workplace or any Home Exposure

The Infant PFT is usually a useful tool in being able to identify and manage the high-risk in the pediatric pneumonia patients who might further need a closer monitoring along with follow-up after the hospital discharge, with  your referral to the pulmonologist and be required to repeat pulmonary function testing.

Measurements that taken from this test is essential in helping your doctor to diagnose asthma. The Forced Expiratory Volume is the first second (FEV 1) – measures amount of the air you could forcefully blow out in first second of your FVC. In case, this number is lower than what is considered normal, it may mean asthma.

The Spirometry and the PFT testing are known to be a solution for the proactive cardiologist.

Spirometry is considered to be a lung-health specific diagnostic tool; it also plays an important role in assessing your cardiovascular risk, including any coronary artery disease.

Normal findings of Spirometry are considered as your FEV1/FVC ratio, If this value is greater than your 0.70, both FEV1 and FVC above value of 80% of the predicted value.

 If the lung volumes are also performed, the TLC above a value of 80% of predictive value is considered normal.

The Diffusion capacity above the value of 75% of predicted value is also considered as normal.

The pulmonary function testing equips your healthcare provider to further diagnose any conditions that could affect the lungs.

The PFTs generally don't take a long time, they aren't also not considered painful and you could also get the results in few days.

PFTS should only be performed to three times to further ensure that your results are reproducible (that is less than the 200ml variation) and also accurate.

The vital capacity (VC) is considered to be maximum volume that is expired after maximum inspiration.

The VC is decreased in any of the restrictive disease but also usually normal in any obstructive disease.

It has been demonstrated that the expert panels could reach up to 77% accuracy when predicting diagnosis based on the PFTs and with the clinical history alone.

The value is considered to be usually abnormal if it is approximately less than 80% of the predicted value.

Any Normal value range might vary slightly among your different laboratories, based on any slightly different ways to determine any normal values.

You could also talk to your healthcare provider about meaning of any specific test results.

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