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Doctor insights on: Does A Normal Spirometry Rule Out Asthma

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Does a normal spirometry rule out asthma?

Does a normal spirometry rule out asthma?

No, but less severe: Normal spirometry is the usual finding with intermittent & mild persistent asthma - at least when symptoms of asthma are not present. Spirometry can still be useful to diagnose asthma in these situations. A significant increase in lung function within the normal range after inhaling albuterol is associated with asthma. You can also provoke asthma using methacholine measuring the effect with spiro. ...Read more

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Pulmonary Function Test (Definition)

Pulmonary function tests is a term used to describe a group of tests done to determine lung function. Spirometry measures the amount of air that can be taken in as well as the flow rate of forcefully exhaled air. A graph is generated and can be used to determine lung function. Likewise lung volumes and diffusing capacity determine the capacity as well as ...Read more


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Can a person with asthma symptoms but no family history, and normal spirometry have asthma?

Can a person with asthma symptoms but no family history, and normal spirometry have asthma?

Yes.: But to determine that, you have to be examined at the exact moment you are having the symptoms, since hyperventilation/panic attacks can mimic asthma attacks. ...Read more

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How accurate is a spirometry test in diagnosing asthma?

How accurate is a spirometry test in diagnosing asthma?

Very but..: Asthma is an intermittent disease, thus a relatively normal lung function test on one occasion does not rule out asthma. However it should be abnormal when you have symptoms and the numbers (fev-1) often improves after bronchodilator. As with all tests, a doctor can only make a diagnosis after having obtained your history, performed a physical exam, and then interpret the lung function results. ...Read more

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Is bronchospasm asthma an will it come up on a spirometry test?

Is bronchospasm asthma an will it come up on a spirometry test?

Maybe: Asthma occurs when people have excessive bronchospasm triggered by allergens, irritants, some medications or environmental exposures. Bronchospasm is typically acute and may not show up on spirometry if there has not been a recent trigger. In this case a methacholine challenge may be used to induce bronchospasm for diagnosis by spirometry. ...Read more

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Raising the shoulders helps me breath easier. Why is this? And if my shoulders were raised during a spirometry, would it hide a condition like Asthma?

Raising the shoulders helps me breath easier. Why is this? And if my shoulders were raised during a spirometry, would it hide a condition like Asthma?

Asthma: Raising the shoulders expands the lungs and it's possible to make it easier to breath. However, it should not affect the diagnosis of asthma based property performed spirometer ...Read more

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If you have exercise induced asthma and have a spirometry test, will it most likely show on the results?

If you have exercise induced asthma and have a spirometry test, will it most likely show on the results?

Depends.....: In exercise-induced asthma, spirometry will be normal at rest unless there is bronchospasm at the time of the test. If the test is done post-exercise, it may show obstruction if the exercise induces bronchospasm. Good luck! ...Read more

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Doc says I've chronic bronchitis but I have no cough or sputum production my full pred. Value spirometry was 83% could it be late onset asthma?

Doc says I've chronic bronchitis but I have no cough or sputum production my full pred. Value spirometry was 83% could it be late onset asthma?

PFT report: If you have a copy of the report, I think it is a good idea to review it with your physician. The interpretation takes into account more than one airflow value. If you have a chronic cough and reflux, then also consider aspiration and bronchoconstriction as a cause. ...Read more

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No cough or sputum but I have a wheeze and tight chest. Pred. Value spirometry is 83%. Is this COPD or late onset asthma?

No cough or sputum but I have a wheeze and tight chest. Pred. Value spirometry is 83%. Is this COPD or late onset asthma?

More information pls: COPD patients typically will produce more sputum or mucus when they cough. Your symptoms may be either but without a history of smoking, asthma is more likely. Since you have had a PFT, asking for the FEV1/FVC ratio will help your physician determine whether there is a component of restriction as well. ...Read more

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Other than asthma, what else can make you fail a spirometer test?

Other than asthma, what else can make you fail a spirometer test?

Many things: Though "failing" is not a term I would use, there are many other conditions that can show up in a spirometry test. These may include lung obstructions, vocal cord dysfunction, copd, etc. Most of the time these conditions will give results that are not characteristically like asthma but feel like it. Good luck. ...Read more

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Is it safe to use an incentive spirometer everyday if you have asthma? Does it help your lungs if you use it daily?

Is it safe to use an incentive spirometer everyday if you have asthma? Does it help your lungs if you use it daily?

Peak Flows: Measuring your peak flows with an incentive spirometer at home is a great and safe way for you and your doctor to monitor your asthma over time. Occasional pulmonary function testing in the office provides valuable information, but tracking peak flows over times also lets us know how well controlled your asthma is. If you want to improve lung function try exercising 4-5 times per week. ...Read more

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Had spirometer test, blew 74 what should it b, 34 y/o female. Have take deep breaths and sigh lots also dry cough at times. Just diagnosed w/asthma.

Had spirometer test, blew 74 what should it b, 34 y/o female. Have take deep breaths and sigh lots also dry cough at times. Just diagnosed w/asthma.

Spirometry: Currently the best test to assess lung function is spirometry. The normal values for fvc is >80%, fev1 >80%, and fev1/fvc ratio 0.80. Typically, the spirometry will be repeated after taking albuterol to assess how much the values increased. ...Read more

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How accurate is a pulmonary function test that's testing for Asthma? Mine came back normal. Could I still possibly have asthma?

How accurate is a pulmonary function test that's testing for Asthma? Mine came back normal. Could I still possibly have asthma?

Short answer is: Yes: You may have a mild form with little exacerbation but a reactive airway disease is present. If there are no exacerbations, no treatment is necessary, ...Read more

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If pulmonary function test shows a mild obstructive ventilatory defect with normal volumes and high dlco but not a smoker and don't have asthma, is this finding significant?

If pulmonary function test shows a mild obstructive ventilatory defect with normal volumes and high dlco but not a smoker and don't have asthma, is this finding significant?

Need more info: You don't mention why you had pfts in the first place. The combination of a mild obstructive defect with normal volumes and high diffusion is typical of asthma. Without clinical data I can't be more specific. People with allergic rhinitis may have sub-clinical asthma. Which form of Hydrocortisone are you taking? Tablets? Topical? ...Read more

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Would a pulmonary function test accurately diagnose asthma?

Would a pulmonary function test accurately diagnose asthma?

Nearly essential: Asthma is not one illness, but several processes that appear in greater or lesser degrees in any one affected individual. Together they can lead to the functional problems we recognize as asthma. Pulmonary function tests measure air flow and volumes; accurately performed PFT's are indispensable in the diagnosis and management of asthma and COPD. ...Read more

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I had a pulmonary function test. I was curious and wondering can someone be accidentally diagnosed with asthma?

I had a pulmonary function test. I was curious and wondering can someone be accidentally diagnosed with asthma?

Hard to say: A lot of what is labeled as asthma may not turn out to be over the long run. Most true asthmatics have some related diagnosis in early childhood, males before one and females by three. Yet I have seen a 16 yo female with her first event. Many teens have transient exercised triggered wheezing, which is less worrisome and often fades with age. You can always under-perform on function tests. ...Read more

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Pulmonary function test in the past show asthma diagnosis. Tomorrow I have repeated pft for uncontrolled asthma. Any suggestions?

Asthma mgt: I would suggest asking for an interpretation in comparison with your prior test. PFTs are one part of the evaluation. If you have uncontrolled asthma, an asthma action plan and review of your medications and triggers is suggested. ...Read more

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Can pulmonary function test tell if I have asthma or any other respiratory diseases?

Can pulmonary function test tell if I have asthma or any other respiratory diseases?

Piece of Puzzle...: A pulmonary function test alone cannot tell a doctor if you have asthma. This test can be very useful but is used in conjunction with other important information including a detailed past medical history and physical exam. Both subjective and objective measures are used to determine if you have asthma or any other respiratory disease. ...Read more

Dr. Chad Levitt
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Spirometry (Definition)

A spirometry is a measurement of velocity (speed) of air coming in & out of the lungs which equals the diameter of the airways. This an indirect measument of the lung function diffeent patterns are posible & direct us as specialist to diagnosed ...Read more


Spirometer (Definition)

This device measures a person's ability to breathe in and out -- how much air, how quickly, for how long, how much air is left behind, etc. This provides some information for diagnosis and determining severity of ...Read more