How affective is the methacholine challenge test for asthma?

Published October 14, 2009

I went to the Dr the other day because I been having SOB and wheezing at night. I had bronchitis about 2months ago but my symptoms never really want away. I did the lung function test and the Dr. said I was borderline. I asked him about the meth test and he said that really isn’t that accurate he said I could have a positive result and not have asthma or I could have a negative result and have it. I am allergic to dust mites, cats, dog, grass, oak tree and mold. So right now I am taking pulmicort and Nasonex and I have an albuterol inhaler. So I was wondering if this is true about the methacholine challeng test