PFT QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS 100%
CORRECT!!!
Normal Lung Volume Percentages (Relative to Total Lung Capacity – TLC)
TLC%
✔✔ TLC = 100%
Total Lung Capacity represents the full volume of air the lungs can hold.
VC% (Vital Capacity)
✔✔ VC = 80% of TLC
This is the maximum amount of air that can be exhaled after a full inhalation.
IC% (Inspiratory Capacity)
✔✔ IC = 60% of TLC
Volume of air that can be inhaled after a normal exhalation.
FRC% (Functional Residual Capacity)
✔✔ FRC = 40% of TLC
Air remaining in the lungs after a normal exhale.
RV% (Residual Volume)
✔✔ RV = 20% of TLC
Air left in the lungs after a maximal exhalation.
Common Lung Volume Measurement Devices
Volume-Measuring Devices (Volumetric Spirometry):
✔✔
Water-seal spirometer
, Wedge bellows spirometer
Dry rolling seal spirometer
These devices directly measure lung volumes based on the movement of air over
time.
Common Flow Measurement Devices (Flow Spirometry):
✔✔
Heated wire pneumotachometer
Turbine flow sensor
Pitot tube flow sensor
Ultrasonic flow sensor
Silverman pneumotachometer
Fleisch pneumotachometer
These devices estimate volume by measuring flow rates and integrating the flow
over time.
what type of volume displacement device consists of 3 cylinders, one of which is
inverted in water? - ANSWER✔✔water seal spirometry
what type of volume displacement device is a collapsible bellows that folds or
unfolds (fan like) in response to breathing excursions and moves pen on paper? -
ANSWER✔✔bellow-type spirometer
what type of volume displacement device is an improvement from the water seal
and has a one-way valve and CO2 absorber for rebreathing tests?
*includes piston-in-cyclinder and a moving seal - ANSWER✔✔dry rolling
spirometer
WITH COMPLETE SOLUTIONS 100%
CORRECT!!!
Normal Lung Volume Percentages (Relative to Total Lung Capacity – TLC)
TLC%
✔✔ TLC = 100%
Total Lung Capacity represents the full volume of air the lungs can hold.
VC% (Vital Capacity)
✔✔ VC = 80% of TLC
This is the maximum amount of air that can be exhaled after a full inhalation.
IC% (Inspiratory Capacity)
✔✔ IC = 60% of TLC
Volume of air that can be inhaled after a normal exhalation.
FRC% (Functional Residual Capacity)
✔✔ FRC = 40% of TLC
Air remaining in the lungs after a normal exhale.
RV% (Residual Volume)
✔✔ RV = 20% of TLC
Air left in the lungs after a maximal exhalation.
Common Lung Volume Measurement Devices
Volume-Measuring Devices (Volumetric Spirometry):
✔✔
Water-seal spirometer
, Wedge bellows spirometer
Dry rolling seal spirometer
These devices directly measure lung volumes based on the movement of air over
time.
Common Flow Measurement Devices (Flow Spirometry):
✔✔
Heated wire pneumotachometer
Turbine flow sensor
Pitot tube flow sensor
Ultrasonic flow sensor
Silverman pneumotachometer
Fleisch pneumotachometer
These devices estimate volume by measuring flow rates and integrating the flow
over time.
what type of volume displacement device consists of 3 cylinders, one of which is
inverted in water? - ANSWER✔✔water seal spirometry
what type of volume displacement device is a collapsible bellows that folds or
unfolds (fan like) in response to breathing excursions and moves pen on paper? -
ANSWER✔✔bellow-type spirometer
what type of volume displacement device is an improvement from the water seal
and has a one-way valve and CO2 absorber for rebreathing tests?
*includes piston-in-cyclinder and a moving seal - ANSWER✔✔dry rolling
spirometer
