Lung Volumes and Capacities

Question 1

Anatomic Dead Space Volume (VD)

Answer 1

Volume of air that occupies the non-respiratory conducting airways

Question 2

Total Lung Capacity (TLC)

Answer 2

Vol of air in lungs after max inspiration; SUM of all vols
TLC = RV + VC
-or-
TLC = FRC + IC

Question 3

Tidal Volume (TV)

Answer 3

Total Vol inspired and expired with each breath during quiet breathing.
(~10% total lung vol)

Question 4

Forced Expiratory Volume (FEV)

Answer 4

Max vol of air exhaled in a specified period of time

Question 5

Minute Volume Ventilation ( VE)

Answer 5

Vol of air expired in one minute

VE = TV x respiratory rate

Question 6

Residual Volume (RV)

Answer 6

Vol of gas remaining in the lungs at the end of a max expiration.
(~25% of total lung vol)

Question 7

Functional Residual Capacity (FRC)

Answer 7

Vol of air in the lungs after normal exhalation
FRC = ERV + RV
(~40% of total lung vol)

Question 8

Expiratory Reserve Volume (ERV)

Answer 8

Max vol of air that can be exhaled after normal tidal exhalation
(15% of total lung volume)

Question 9

Forced Vital Capacity (FVC)

Answer 9

Vol of air expired during a forced max expiration after a forced max inspiration

Question 10

Inspiratory Reserve Volume (IRV)

Answer 10

Max vol of air that can be inspired after normal tidal vol inspiration
(~50% of total lung vol)

Question 11

Peak Expiratory Flow (PEF)

Answer 11

Max flow of air during beginning of forced expiratory maneuver

Question 12

Vital Capacity (VC)

Answer 12

Vol change that occurs between max inspiration and max expiration
VC = TV + IRV + ERV
(~75% total lung vol)

Question 13

Inspiratory Capacity (IC)

Answer 13

Max vol of air that can be inspired after normal tidal exhalation.
IC = TV + IRV
(~60% of total lung vol)