What Is Spirometry?
When you’re having trouble breathingyour doctor might order a test called spirometry. Spirometry is a very common test to see how well your lungs work. Spirometry measures three things:
- How much air you can breathe in (inhale)
- How much air you can breathe out (exhale)
- How fast you can exhale the air from your lungs
Conditions That Spirometry Can Diagnose
Your doctor will look at your test results to figure out what may be making it hard to breathe. Common causes include:
- Asthma
- Chronic obstructive pulmonary disease (COPD)
- Cystic fibrosis
- Scars in your lungs (pulmonary fibrosis)
How to Prepare for the Spirometry Test
You don’t need to do anything to prepare for spirometrythough there are a few things to keep in mind:
- Don’t eat a big meal right before the test.
- Ask your doctor if there are medications you should not take the day of the test.
- Wear comfortable clothes.
The test itself takes about 15 minutes. It’s done in your doctor’s officeand afterwardyou can go about your day as normal.
Spirometry test cost
This test costs around $60. This is the self-pay price; check with your insurance provider to see if they cover the cost of spirometry.
Spirometry Test
You’ll sit in a chair and have a clip placed on your nose to keep your nostrils closed. Thenyou’ll take a deep breath and exhale as quickly and hard as you can for several seconds into a tube.
You’ll need to wrap your lips tightly around the tube so all your air goes into it. The tube connects to a machine called a spirometer. It records how much air you breathe out from your lungs and the speed at which you exhale. Usuallythe test is given three times to make sure the results are the same every time. If there are too many differences between the three test resultsyou may need to take the test again. Your doctor will use the highest value from the three results.
All this information helps the doctor figure out what’s causing your breathing problems.
Spirometry Test Risks
Spirometry is a painless test. Most people have no problems with it. Depending on your healththe deep breathing might make you feel a little tired or lightheaded.
If you have heart disease or have had surgery recentlycheck with your doctor to make sure spirometry won’t be a problem for you.
Spirometry Test Results
You might hear your doctor or a technician refer to two key measurements in spirometry. They are:
- Forced vital capacity (FVC). This measures the amount of air you can breathe in and out.
- Forced expiratory volume (FEV-1). This measures how much air you can exhale from your lungs in 1 second.
A doctor will look at your ageheightand gender to figure out whether your results are in the normal range. Numbers outside this range can suggest a lung problem.
Your doctor should get a report within a few days and talk it over with you.
If the doctor thinks your airways are blockedthey may give you a medication that opens them up. It’s called a bronchodilator. After several minutesyou may take the spirometry test again to see whether the bronchodilator made a difference.
A low FEV-1 score suggests you have an obstructive airway disease such as COPD. This means your lungs can fill with air normallybut your airways are too narrow to exhale as much as they should.
If your lungs can’t fill enoughyou have a restrictive lung disease.
There are several types of these conditionsbut one of the most common is pulmonary fibrosis. If you have this diseasesome of the tissue in your lungs has become scarred. It won’t expand when you inhaleso you can never get quite enough breath.
Spirometry normal values
Things like your heightweightagesexand racial or ethnic background will help determine the normal range for your spirometry results. In generalhere are the ranges your doctor will look for:
- FEV-1: 80% to 120%
- FVC: 80% to 120%
Do I Need Spirometry?
This is one of the most important tests for a doctor to diagnose lung disease.
If you’re having any breathing problemstalk about spirometry with your doctor. If there's a chance you might have COPDasthmaor some other lung conditionthis test is a good first step toward getting a diagnosis.
Spirometry is also helpful in testing how well a bronchodilator or other treatment is working. You may have had spirometry testing when you were first diagnosed with asthma. A test after you’ve been taking asthma medications for a while can let you and your doctor know whether you’re on the right treatment track.
Follow-Up and Next Steps
If your spirometry results are abnormalthis could be a sign of a lung problem. But keep in mind that sometimes test results can show up as abnormal even when your lungs are fine. The test results will show if you need an inhaler or other medicine for better lung health. You may need to repeat the spirometry in the future to track how well your lungs are working.
Takeaways
Spirometry is a common test used to find out how well your lungs are working by measuring how much air you can breathe in and outas well as how fast you can do it. It helps diagnose conditions like asthmaCOPDcystic fibrosisand pulmonary fibrosis. Spirometry is also crucial for figuring out how well treatment is workingespecially for conditions like COPD and asthma. If you have breathing problemsdiscussing spirometry with your doctor is important for proper diagnosis and treatment.
