spirometry

Question 1

Tidal volume (TV)

Answer 1

volume inspired or expired with each breath at rest

500ml in males, 350ml in females

Question 2

Inspiratory reserve volume (IRV) = 2-3 L

Answer 2

maximum volume of air that can be inspired at the end of a normal tidal inspiration

IC = TV + IRV

Question 3

Expiratory reserve volume (ERV) = 750ml

Answer 3

maximum volume of air that can be expired at the end of a normal tidal expiration

Question 4

Residual volume (RV) = 1.2L
volume of air remaining after maximal expiration

Answer 4

increases with age

RV = FRC - ERV

Question 5

Functional residual capacity (FRC)

Answer 5

the volume in the lungs at the end-expiratory position

FRC = ERV + RV

Question 6

Vital capacity (VC) = 5L

Answer 6

maximum volume of air that can be expired after a
maximal inspiration

4,500ml in males, 3,500 mls in females
decreases with age

VC = IC + ERV

Question 7

Total lung capacity (TLC)

Answer 7

is the sum of the vital capacity + residual volume

Question 8

IC

Answer 8

Inspiratory capacity = The maximum volume of air that can be inspired after reaching the end of a normal, quiet expiration