5 doctors weighed in:
How accurate is the methacholine challenge test for asthma?
5 doctors weighed in

Dr. David Shulan
Internal Medicine - Allergy & Immunology
4 doctors agree
In brief: Pretty good
The test is fairly accurate.
A common cold within 6 weeks before the test can cause a false positive. Many people with nasal allergies will have a positive test in season and a negative test outside the season.

In brief: Pretty good
The test is fairly accurate.
A common cold within 6 weeks before the test can cause a false positive. Many people with nasal allergies will have a positive test in season and a negative test outside the season.
Dr. David Shulan
Dr. David Shulan
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