You get breathless walking up a flight of stairs, but your chest X-ray looks normal. Or perhaps you have been coughing and wheezing for months, yet every medicine seems to provide only temporary relief.
This can be frustrating.
Patients often assume that a scan or X-ray should be enough to explain a breathing problem. But some lung conditions are better understood by checking how your lungs actually work.
That is where a pulmonary function test can help.
A pulmonary function test, or PFT, is a group of breathing tests used to assess how well your lungs are working.
Depending on the test, it can measure how much air you can breathe in and out, how quickly you can move air, and how effectively your lungs transfer oxygen into the blood.
The results can give your doctor useful information about conditions such as asthma, COPD, and other breathing disorders.
Breathlessness can have many causes.
It may be related to asthma, COPD, another lung condition, heart problems, anaemia, poor fitness, anxiety, or other issues.
A PFT can provide information about lung function and help your doctor determine whether the lungs may be contributing to your symptoms.
If coughing and wheezing keep returning, your doctor may want to know whether your airways are narrowing or whether there is another problem affecting airflow.
PFT results can be particularly useful when symptoms suggest asthma or obstructive airway disease.
COPD is associated with persistent airflow limitation.
Spirometry, one of the most commonly used pulmonary function tests, plays an important role in evaluating suspected COPD. It measures how much air you can forcefully breathe out and how quickly you can do it.
The test does not replace a medical consultation, but it can provide an important piece of evidence.
The test is usually performed while you are sitting.
You will breathe through a mouthpiece connected to a machine. The technician will give you clear instructions about when to breathe normally, take a deep breath, and blow out as hard and fast as you can.
Some measurements may need to be repeated to make sure the results are reliable.
Depending on the reason for testing, your doctor may also compare breathing before and after a prescribed bronchodilator.
No.
A pulmonary function test is generally non-invasive. You may feel temporarily tired, light-headed, or slightly breathless after forceful breathing, but the test itself does not involve needles or surgery.
Tell the technician if you feel unwell during testing.
Consider a patient who has been experiencing breathlessness while walking but has a relatively normal chest X-ray.
Instead of assuming that nothing is wrong, the doctor may look at lung function. If testing shows airflow limitation, it provides useful evidence that can guide further evaluation.
The opposite can also happen: lung function may be relatively normal, prompting the doctor to consider other causes of breathlessness.
That is why testing is valuable—it can help narrow the possibilities rather than simply confirming what the patient already suspects.
This is worth saying clearly.
A normal pulmonary function test does not automatically mean there is nothing wrong with you.
Some respiratory conditions can have normal results between episodes. Symptoms can also come from problems that a standard PFT is not designed to detect.
If your symptoms continue despite a normal test, your doctor may need to consider your full history, examination, and other investigations.
Never judge your health based on one number or one report.
It can be.
Asthma involves variable narrowing of the airways, so lung function testing may provide useful information. In some patients, results may change depending on whether symptoms are active or whether a bronchodilator has been used.
However, asthma is diagnosed based on the overall clinical picture, not one test result alone.
Your doctor may recommend additional testing when the diagnosis remains uncertain.
The global burden of chronic respiratory disease is significant.
The World Health Organization estimates that COPD caused approximately 3.5 million deaths worldwide in 2021.
This does not mean that every person with breathlessness has COPD. But it is a good reminder that persistent respiratory symptoms should be properly evaluated, particularly when they interfere with normal activity.
PFTs are commonly used in adults and can also be performed in children who are old enough to follow the instructions properly.
However, the decision to perform testing depends on the patient's symptoms and medical situation.
Your doctor may also give specific instructions before the test, such as whether certain inhalers should be withheld temporarily. Do not stop prescribed medication unless your healthcare professional tells you to.
Your effort during the test matters.
If you do not follow the technician's instructions or cannot perform the breathing manoeuvres properly, the results may not accurately represent your lung function.
Smoking, recent illness, certain medicines, and other factors can also influence results.
This is why interpretation by a trained healthcare professional is important.
Dr. Nikhil Modi is a pulmonary and critical care specialist who evaluates patients with breathing difficulties and suspected respiratory disorders. In someone with unexplained breathlessness, persistent cough, wheezing, or suspected COPD or asthma, pulmonary function testing may provide useful information to support diagnosis and guide an appropriate treatment plan.
Follow the instructions provided by the testing centre or your doctor.
Wear comfortable clothing that does not restrict your chest or abdomen. Avoid smoking immediately before testing, unless your healthcare provider has given different instructions.
Most importantly, tell the technician about your medicines and any recent respiratory illness.
A PFT checks how well your lungs work. It can help doctors evaluate conditions such as asthma, COPD, and other causes of abnormal breathing or unexplained breathlessness.
The duration varies depending on which tests are required. A basic spirometry assessment may be relatively quick, while a complete set of pulmonary function tests can take longer.
For most people, PFTs are safe and non-invasive. The forceful breathing required can temporarily cause mild dizziness or breathlessness. Tell the technician immediately if you feel uncomfortable.
You cannot always understand lung function from symptoms or an X-ray alone.
If you have persistent cough, unexplained breathlessness, recurring wheezing, or are being evaluated for asthma or COPD, your doctor may recommend pulmonary function testing to get a clearer picture of how your lungs are working.
If your breathing symptoms are persistent or unexplained, speak with a qualified respiratory specialist about whether a pulmonary function test in Sukhdev Vihar is appropriate for you.
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