FEV1/ FEVC ratio is decreased in all, except
High-Yield Explanation
ParameterObstructive lung diseaseRestrictive lung diseaseTotal lung capacityNormal to increaseDecreaseResidual volumeIncreaseDecreaseVital capacityDecreaseDecreaseFEV1/ FVC (FEV1%)DecreaseNormal to increaseFEF 25-75% (Forced expiratory flow rate)Decrease NormalDiffusion capacityNormal (| in emphysema)decreased(Refer: Harrison's Principles of Internal Medicine, 18thedition, pg no: 2163-2165)