Parameters Measured by Spirometry

Question 1

Tidal Vol

Answer 1

Vol. of air inspired & expired with normal breath

Question 2

Residual Volume

Answer 2

Vol. of gas left in lung after max. expiration

Question 3

Vital Capacity/Forced Vital Capacity

Answer 3

Max. air that can be expired after max. inspiration

Question 4

Functional Residual Capacity

Answer 4

Vol. of air left in lungs after normal expiration

Question 5

Forced Expiratory Flow Rate

(FEF₂₅; FEF₅₀; FEF₇₅)

Answer 5

Vol. of air forcibly ehaled per unit time at 25%, 50%, etc. of FVC

Question 6

Peak Expiratory Flow Rate

Answer 6

Highest rate of flow sustained at which air can be expelled from lungs