Join the Meeting Place for Moms!
Talk to other moms, share advice, and have fun!

(minimum 6 characters)

Pulmonary function test

Posted by on Feb. 27, 2015 at 3:51 PM
  • 6 Replies
My doctor wants to do a pulmonary function test on me I have asthma but he suspects it has gotten a lot worse. I have had Bronchitis twice in the last month at least I think I have he doesn't think I have gotten rid of it completely. The antibiotics I have been on are z-PAC, Amoxazillan, and a few others and they don't seem to be working. My question what is a pulmonary function test and what do you do?
by on Feb. 27, 2015 at 3:51 PM
Add your quick reply below:
You must be a member to reply to this post.
Replies (1-6):
LawNOrderMommy
by Silver Member on Feb. 27, 2015 at 3:57 PM
I had to do one after I went through an awful cycle of pneumonia, bronchitis, pneumonia, etc over four months. It is a two part test, the first part is taking a deep breath and blowing out into a tube for as long as possible. The second part consists of taking short, monitored breathes. Both look at how well your lungs function.
Elyce225
by on Feb. 27, 2015 at 3:59 PM


You blow into a tube.

AddictiveSide
by Don't worry-be happy on Feb. 27, 2015 at 3:59 PM
You have to blow into a machine. You may think you've blown out all of your air, but you literally have keep blowing for as long as possible.
If you don't, you have to do it again.
Sassy762
by CAFE SASSY HBIC on Feb. 27, 2015 at 4:00 PM

Pulmonary function tests are a group of tests that measure how well the lungs take in and release air and how well they move gases such as oxygen from the atmosphere into the body's circulation.

How the Test is Performed

Spirometry measures airflow. By measuring how much air you exhale, and how quickly, spirometry can evaluate a broad range of lung diseases. In a spirometry test, while you are sitting, you breathe into a mouthpiece that is connected to an instrument called a spirometer. The spirometer records the amount and the rate of air that you breathe in and out over a period of time. When standing, some numbers might be slightly different. The most important issue is to perform the test always while at the same position.

For some of the test measurements, you can breathe normally and quietly. Other tests require forced inhalation or exhalation after a deep breath. Sometimes you will be asked to inhale the substance or a medicine to see how it changes your test results.

Lung volume measurement can be done in two ways:

  • The most accurate way is to sit in a sealed, clear box that looks like a telephone booth (body plethysmograph) while breathing in and out into a mouthpiece. Changes in pressure inside the box help determine the lung volume.
  • Lung volume can also be measured when you breathe nitrogen or helium gas through a tube for a certain period of time. The concentration of the gas in a chamber attached to the tube is measured to estimate the lung volume.

To measure diffusion capacity, you breathe a harmless gas, called a tracer gas, for a very short time, often for only one breath. The concentration of the gas in the air you breathe out is measured. The difference in the amount of gas inhaled and exhaled measures how effectively gas travels from the lungs into the blood. This test allows the doctor to estimate how well the lungs move oxygen from the air into the bloodstream.

How to Prepare for the Test

Do not eat a heavy meal before the test. Do not smoke for 4 to 6 hours before the test. You will get specific instructions if you need to stop using bronchodilators or inhaler medications. You may have to breathe in medication before or during the test.

How the Test will Feel

Since the test involves some forced breathing and rapid breathing, you may have some temporary shortness of breath or light-headedness. You breathe through a tight-fitting mouthpiece and you will have nose clips. If you are claustrophobic, the clear box part of the test may feel uncomfortable.

Why the Test is Performed

Pulmonary function tests are done to:

  • Diagnose certain types of lung disease (such as asthmabronchitis, and emphysema)
  • Find the cause of shortness of breath
  • Measure whether exposure to chemicals at work affects lung function
  • Check lung function before someone has surgery

It also can be done to:

  • Assess the effect of medication
  • Measure progress in disease treatment

Normal Results

Normal values are based upon your age, height, ethnicity, and gender. Normal results are expressed as a percentage. A value is usually considered abnormal if it is less than 80% of your predicted value.

Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

Different measurements that may be found on your report after pulmonary function tests include:

  • Diffusion capacity to carbon monoxide (DLCO) 
  • Expiratory reserve volume (ERV)
  • Forced vital capacity (FVC)
  • Forced expiratory volume (FEV)
  • Forced expiratory flow 25% to 75%
  • Functional residual capacity (FRC)
  • Maximum voluntary ventilation (MVV)
  • Residual volume (RV)
  • Peak expiratory flow (PEF).
  • Slow vital capacity (SVC)
  • Total lung capacity (TLC)

What Abnormal Results Mean

Abnormal results usually mean that you may have chest or lung disease.

Some lung diseases (such as emphysema, asthma, chronic bronchitis, and infections) can make the lungs contain too much air and take longer to empty. These lung diseases are called obstructive lung disorders.

Other lung diseases make the lungs scarred and smaller so that they contain too little air and are poor at transferring oxygen into the blood. Examples of these types of illnesses include:

  • Extreme overweight
  • Fibrosis of the lungs
  • Lung cancer
  • Sarcoidosis and scleroderma

Muscular weakness can also cause abnormal test results, even if the lungs are normal, similar to the diseases that cause smaller lungs

Risks

The risk is minimal for most people. There is a small risk of collapsed lung (pneumothorax) in people with a certain type of lung disease. The test should not be given to a person who has experienced a recent heart attack, has certain other types of heart disease, or has had a recent collapsed lung.

cjsix
by Platinum Member on Feb. 27, 2015 at 4:02 PM

Pulmonary function testing is not so bad. I have done it several times. Depending on what the doctor is wanting,it is a tube that you take as deep a breath as you possibly can and then blow until you literally can't blow anything more. This measures your lung capacity. If he sends you to a Pulminary doctor then they will likely do the same as well as have you go into a small booth and do a similar test but,the tube will be hooked to a machine which measures several different things. The worst for me is that doing these tends to make me cough.

Add your quick reply below:
You must be a member to reply to this post.
Join the Meeting Place for Moms!
Talk to other moms, share advice, and have fun!

(minimum 6 characters)