PFT Lung Definitions

Question 1

Define Tidal Volume and what is a normal value in a 70 kg pt?

Answer 1

the lung volume representing the normal volume of air displaced between normal inhalation and exhalation when extra effort is not applied
~500 mL

Question 2

Define Residual Volume and what is a normal value in a 70 kg pt?

Answer 2

the amount of air that remains in a person’s lungs after maximum exhalation
~1.5 L

Question 3

Define Expiratory Reserve Volume and what is a normal value in a 70 kg pt?

Answer 3

the additional amount of air that can be expired from the lungs by determined effort after normal expiration
~1.5 L

Question 4

Define inspiratory reserve volume and what is a normal value in a 70 kg pt?

Answer 4

the additional amount of air that can be inspired into the lungs by determined effort after normal inspiration
~2.5 L

Question 5

Define functional residual volume and what is a normal value in a 70 kg pt?

Answer 5

the volume of air present in the lungs at the end of passive expiration
~3 L

Question 6

Define inspiratory capacity and what is a normal value in a 70 kg pt?

Answer 6

the amount of air that can be inhaled after the end of a normal expiration
~3 L

Question 7

Define total lung capacity and what is a normal value in a 70 kg pt?

Answer 7

volume of air contained in the lungs at the end of a maximal inspiration
~6 L

Question 8

Define vital capacity and what is a normal value in a 70 kg pt?

Answer 8

the greatest volume of air that can be expelled from the lungs after taking the deepest possible breath
~4.5 L