Scoop, I am curious about your comment that you wonder if diagnosis of “asthma is correct. There is no definitive test for it I think”

I was diagnosed with mild asthma by the first pulmonologist I saw after my abnormal CT with nodules and trees-in-bud, but before bronchiectasis developed. He did a methacholine challenge and mine showed 20%decrease in FEV1 and a rapid response to bronchodilators and he said it was diagnostic for asthma. I’d also had a PFT at an immunologist office a few years before and one at work. My immunology appointment was for an autoimmune condition, but I was having the horrid coughing episodes and she was convinced I had asthma. She did a PFT in office immediately and I passed (though barely). I’d also had a previous one at work that was normal. I told the doc who did the methacholine challenge about the two previous normal ones and he said I hadn’t had the right test and suspected I’d had asthma for a while. Because of his comment and Mayo’s agreement with diagnosis, I thought the challenge was a pretty definitive test, but haven’t done research. Have you had one? Are they typically ordered?