Total Lung Capacity(TLC)– Volume of air in lungs after maximal inspiration
Residual Volume(RV)-Volume of air in lungs after maximal expiration
Vital capacity(VC)– TLC-RV
Forced Expiratory volume1(FEV1)-Volume of air forcibly expired in first secons
Peak Expiratory Flow Rate(PEFR),Maximal Mid Expiratory flow rate- Flow rate at middle 50% of VC
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