Lung Volumes — VATIRE

Expansion

• TV — Tidal Volume (~500 mL): volume of a normal resting breath
• IRV — Inspiratory Reserve Volume (~3000 mL): maximum extra air inspired above TV
• ERV — Expiratory Reserve Volume (~1100 mL): maximum air forcibly expired after normal expiration
• RV — Residual Volume (~1200 mL): air remaining after maximum expiration; not measurable by spirometry
• IC — Inspiratory Capacity = TV + IRV
• FRC — Functional Residual Capacity = ERV + RV (volume at end of normal expiration)
• VC — Vital Capacity = TV + IRV + ERV
• TLC — Total Lung Capacity = VC + RV (~6000 mL in an average adult)