This topic will help you learn about lung function tests and how to prepare for them.
What are Pulmonary Function Tests (PFTs)?
Pulmonary function tests (PFTs) are tests that measure the efficiency of the lungs in breathing (air exchange, meaning inhalation and exhalation). Pulmonary function tests include various types, some of which measure the efficiency of the lungs in absorbing oxygen into the blood, and how exercise affects the lungs. They may also be used with other tests to help diagnose and monitor certain lung diseases.
When are Pulmonary Function Tests (PFTs) performed?
Pulmonary function tests (PFTs) are often performed if a patient is undergoing surgery or if they are experiencing symptoms in the lungs or airways. These symptoms include:
- Cough (especially if accompanied by phlegm or mucus).
- Chest tightness, pain, or pressure.
- Shortness of breath.
- Difficulty breathing or taking a deep breath.
The importance of preventing lung diseases
It is important to maintain lung health, as our bodies have a natural system to protect the lungs from germs and dirt. There are certain measures that can reduce the risk of developing lung diseases:
- Avoid smoking: It is the main cause of lung cancer and chronic lung diseases, such as chronic bronchitis.
- Regular check-ups: Regular tests help detect diseases at their early stages.
- Indoor air quality: It is recommended to take measures to improve indoor air quality, such as regularly opening windows and doors.
- Avoid outdoor pollution: Avoid exercising outdoors on days with severe pollution, and avoid being near areas with heavy traffic.
- Exercise: Maintain physical activity as it improves lung health and helps strengthen them.
What are the types of Pulmonary Function Tests (PFTs)?
- Lung volume test (or body plethysmography): This test measures the different amounts of air in the lungs at various points of inhalation and exhalation.
- Spirometry test: This test measures the amount of air that can be inhaled and exhaled, as well as estimating the amount of air present in the lungs.
- Gas diffusion study test: This test measures the amount of oxygen and other gases that pass from the lungs into the blood.
- Cardiopulmonary Exercise Test (CPET): This test measures how efficiently the heart, lungs, and muscles work during exercise.
How are Pulmonary Function Tests (PFTs) performed?
The procedure varies depending on the type of test, and may include the following steps:
- Lung volumes or body plethysmography test:
- Clips are placed on the patient’s nose, and the patient sits inside a clear booth.
- The door is closed for approximately five minutes.
- The patient places their lips around the mouthpiece.
- Instructions on how to breathe are clarified (by the healthcare provider).
- Spirometry Test and Gas Diffusion Study:
- Clips are placed on the patient’s nose to ensure breathing is through the mouth and not the nose.
- The patient places their lips around the mouthpiece.
- Instructions on how to breathe are clarified (by the healthcare provider).
- Cardiopulmonary Exercise Test (CPET):
- The patient is connected to devices that measure heart rate, blood pressure, and blood oxygen levels.
- The patient walks on a treadmill or rides a stationary bicycle.
- Instructions are clarified by the healthcare provider.
How to prepare for Pulmonary Function Tests (PFTs)?
The healthcare provider asks the patient to do the following before conducting pulmonary function tests to ensure accurate results:
- Avoid eating a heavy meal.
- Avoid consuming caffeine.
- Wear loose and comfortable clothing.
- Avoid intense exercise.
- Avoid using tobacco products.
Frequently Asked Questions (FAQs)
- Are Pulmonary Function Tests Safe?
- Pulmonary function tests are safe and do not require the healthcare provider to insert any tools or devices into the body.
- What is the most common Pulmonary Function Test?
- Spirometry is the most common and widely used type of pulmonary function test.
- How long does it take to perform Pulmonary Function Tests?
- A pulmonary function test may take from 15 to 90 minutes, as the duration varies depending on the type of test.
