Why do doctors tell you not smoke or to use caffeine before a methacholine challenge test?

For unaltered result. Since both caffeine (which can relax the bronchial muscle tone) and smoking - (which can irritate bronchial muscle tone making it more sensitive) - can affect the test - these factors and others are to be avoided ahead of a methacholine test which is trying to guage the patient's baseline bronchial reactivity (often to investigate the presence of asthma).

Related Questions

Why do doctors tell you not smoke or to use caffine before the methacholine challenge test?

For unaltered result. Since both caffeine (which can relax the bronchial muscle tone) and smoking - (which can irritate bronchial muscle tone making it more sensitive) - can affect the test - these factors and others are to be avoided ahead of a methacholine test which is trying to guage the patient's baseline bronchial reactivity (often to investigate the presence of asthma). Read more...

Will singulair (montelukast) significantly effect a methacholine challenge test?

Yes it will. Before doing Methacholine Chalenge test you are adviced to stop taking long acting Bronchodilaters,Allergy Meds Steroids and Singular as it may affect the test Singular needs to be stopped at least 24 hour before your test It can significantly affect the test. Read more...

I had the methacholine challenge test and it triggered bronchospasm on the lowest dose. What does this mean? Should I be on bronchodialators? I'm 27.

Yes, if bronchospasm. Nick-there are many different types of inhalers used to treat bronchospasm, one class specifically reduces 'swelling" of airways, the other two classes act directly on airway smooth muscle. If methacholine is a pronounced trigger, you may benefit most from a drug called ipratroprium bromide-this opposes the effect of choline. Read more...
Probably. It means you may have reactive airways disease. There are many inhaled drugs that can treat this, and published guidelines. Talk with your doctor about any further testing and follow his/her advice. Read more...

How long does it take to get results of the methacholine challenge test?

Methacholine test. The test result is available as soon as the test is completed. It can take half to one hour. A physician has to interpret the test results. Some times the answer may not be clear cut. Read more...

If a person has chronic hyperventilation syndrome and takes a pft and methacholine challenge test would the results be affected? Mine showed asthma.

No. When i think of hyperventalation i think of anxiety linked causes. These problems should not affect well done pfts and methacholine testing. However anxiety can appear to worsen asthma...Subjectively but won't affect well done objective testing. Anxiety can also lead to a misdiagnosis of asthma in a couple of ways....An example is anxiety induced vocal cord dysfunction. Read more...

How reliable is the methacholine challenge test for asthma?

Quite... It is quite reliable for the diagnosis of asthma but other disorders can also yield a positive test. Therefore, your doctor needs to diagnose a positive test as asthma based on the clinical circumstances of the individual patient. Read more...

What causes hyperactive lungs? I had the methacholine challenge test and I was very sensitive. How can I fix this naturally? I'm on advair 100 now.

Asthma. The most common cause in someone your age would be airway inflammation triggered by allergies. Airway hyperactivity is a component of asthma. The advair you are on is indicated for asthma. I would suggest you see a board-certified allergy/asthma specialist for an evaluation. Read more...
Difficult. Mostly by avoiding those environmental stimulants but desensitization with the aid of an allergist might help. Read more...