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Conduct relevant research to look for these two measures: Forced Vital Capacity (FVC) and Forced Expiratory...

Conduct relevant research to look for these two measures: Forced Vital Capacity (FVC) and Forced Expiratory Volume at 1 Second (FEV1). Define FVC and FEV1. What is the significance of the FEV1/FVC ratio? For a healthy adult, what are the normal values/ranges for FVC, FEV1, and FEV1/FVC ratio?

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Answer #1

Forced vital capacity is the amount of air that can be exhaled out of lungs after a maximum inspiration.
normal value for males (20-60yrs) = 5.5 to 4.75 liters

normal values for females (20-60yrs) = 3.75 to 3.25 liters.
Forced expiratory volume in 1 sec is the volume of air forcefully exhaled in 1 second after a maximum inspiration.
Normal values for males (20-60yrs)=4.5 to 3.5 liters
normal values for females (20-60yrs) = 3.25 to 2.5 liters.
The ratio of forced expiratory volume in 1 sec to forced vital capacity is the fev1/fvc.
fev1/fvc ratio is decreased obstructive lung diseases such as asthma,COPD.
In restrictive lung diseases such as pulmonary fibrosis the fev1/fvc remains normal or may increase.
Normal value of fev1/fvc should be 70-85%

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