lung volumes and capacities and numbers

total lung capacity (TLC)

volume of gas in the lungs after a maximum inhalation

vital capacity (VC)

maximum amount of gas that can be exhaled after a maximum inhalation

total volume (TV)

volume of gas inspired or expired during each normal ventilation cycle

inspiratory capacity (IC)

maximum amount of gas that can be inhaled after a normal exhalation

inspiratory reserve volume (IRV)

maximum amount of gas that can be inhaled after a normal inhalation

expiratory reserve volume (ERV)

maximum amount of gas that can be forcefully exhaled after a normal exhalation

functional residual volume (FRV)

volume of gas left in lungs after a normal exhalation

residual volume (RV)

volume of gas left in the lungs after a maximum exhalation

respiratory rate (breaths/min)

• male: 12-18/min

• female: 12-18/min

tidal volume

• male: 500mL

• female: 500mL

minute respiratory volume

• male: 6000-9000mL/min

• female: 6000-9000mL/min

equation: MRV = TV x RR

expiratory reserve volume

• male: 1000mL

• female: 700mL

vital capacity

• male: 4800mL

• female: 3100mL

equation: VC = IRV + ERV + TV

inspiratory reserve volume

• male: 3300mL

• female:1900mL

inspiratory capacity

• male: 3800mL

• female: 2400mL

equation: IC = IRV +TV

residual volume

• male: 1200mL

• female: 1100mL

equation: RV = VC x 0.25

functional residual capacity

• male: 2200mL

• female: 1800mL

equation: FRC = ERV + RV

total lung capacity

• male: 6000mL

• female: 4200mL

equation: TLC = TV + ERV + IRV + RV

forced expiratory volume (timed)

• %FEVt (1 second) = (FEV1sec/VC)(100%)

• %FEVt = 78%