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.