The purpose of this template is to record raw lung function measurements made as part of a methacholine challenge e.g. FEV1 recorded after a methacholine conc. of 4.0 mg/ml. Baseline measurements of lung function made specifically for the purposes of this challenge should also be annotated using this column template. Column template MethacholineChallengePerc should be used for data expressed as percentage predicted values while MethacholineChallengeParameter should be used for derived parameters such as PD20 or DRR.