Calculate lung capacities including vital capacity (VC), total lung capacity (TLC), inspiratory capacity (IC), and functional residual capacity (FRC) using spirometry values.
Total Lung Capacity (TLC)
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Vital Capacity (VC)
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Inspiratory Capacity (IC)
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Functional Residual Capacity (FRC)
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Vital capacity (VC) is the maximum amount of air a person can exhale after taking the deepest breath possible. It represents the total usable lung capacity and is calculated as IRV + TV + ERV.
Vital capacity is calculated using the formula: VC = IRV + TV + ERV, where IRV is inspiratory reserve volume, TV is tidal volume, and ERV is expiratory reserve volume.
The vital capacity equation is VC = IRV + TV + ERV. This represents the sum of inspiratory reserve volume, tidal volume, and expiratory reserve volume, measuring the maximum air exchange capacity.
Tidal volume (TV) is the normal amount of air inhaled or exhaled during quiet breathing (about 500mL). Vital capacity is much larger, representing the maximum air capacity including reserve volumes.
Total lung capacity (TLC) is calculated as TLC = IRV + TV + ERV + RV. It includes all lung volumes: inspiratory reserve, tidal volume, expiratory reserve, and residual volume.
Functional residual capacity (FRC) is the amount of air remaining in the lungs after normal expiration. It's calculated as FRC = ERV + RV and represents the lung's resting volume.
Normal total lung capacity ranges from 5,000-7,000mL for adults. Vital capacity typically ranges 3,000-5,000mL, while tidal volume is around 500mL. Values vary based on age, height, gender, and fitness level.
Inspiratory capacity (IC) is the maximum amount of air a person can inhale after normal expiration. It's calculated as IC = IRV + TV, combining tidal volume with inspiratory reserve volume.