FEV1 vs FVC

[mom2lillian]

Ok so I know what the definition of both is and at some poitn I knew a bit more about why they used FEV1 but could someone please tell me why the FEV1 is the important one that everyone compares and goes by?

If anyone is not familiar with the definitions here is a decent link that has buttons at top you can clikc on for definitions and diagrams of each measurement.

<a target=_blank class=ftalternatingbarlinklarge href="http://www.spirxpert.com/indices7.htm
">http://www.spirxpert.com/indices7.htm
</a>

 

[mom2lillian]

Ok so I know what the definition of both is and at some poitn I knew a bit more about why they used FEV1 but could someone please tell me why the FEV1 is the important one that everyone compares and goes by?

If anyone is not familiar with the definitions here is a decent link that has buttons at top you can clikc on for definitions and diagrams of each measurement.

<a target=_blank class=ftalternatingbarlinklarge href="http://www.spirxpert.com/indices7.htm
">http://www.spirxpert.com/indices7.htm
</a>

 

[mom2lillian]

Ok so I know what the definition of both is and at some poitn I knew a bit more about why they used FEV1 but could someone please tell me why the FEV1 is the important one that everyone compares and goes by?

If anyone is not familiar with the definitions here is a decent link that has buttons at top you can clikc on for definitions and diagrams of each measurement.

<a target=_blank class=ftalternatingbarlinklarge href="http://www.spirxpert.com/indices7.htm
">http://www.spirxpert.com/indices7.htm
</a>

 

[NoExcuses]

I'll copy and paste right from your link. This is why FEV1 is used.

"FEV1 is by far the most frequently used index for assessing airway obstruction, bronchoconstriction or bronchodilatation;"

It assesses airway obstruction. What do CFer's have? Sputum in their airways and damanaged lungs.

 

[NoExcuses]

I'll copy and paste right from your link. This is why FEV1 is used.

"FEV1 is by far the most frequently used index for assessing airway obstruction, bronchoconstriction or bronchodilatation;"

It assesses airway obstruction. What do CFer's have? Sputum in their airways and damanaged lungs.

 

[NoExcuses]

I'll copy and paste right from your link. This is why FEV1 is used.

"FEV1 is by far the most frequently used index for assessing airway obstruction, bronchoconstriction or bronchodilatation;"

It assesses airway obstruction. What do CFer's have? Sputum in their airways and damanaged lungs.

 

[luke]

nicole,

Simply put...CF is an obstructive disease, meaning there is a problem getting air out. FEV1 is used to determine the level/presence of obstruction. Hence that is what is used to determine.

The FVC is used to determine restrictive disease, abilty to get air in. Now this is where it gets a little confusing. CF also has a restrictive component that is caused by all of the "scarring" from frequent infections. So our FVC also is effected.

Long story short, the more air you get in the more air you "could" get out. But in order to judge our function FEV1 is the test the identifies our woes.

hope this helps

 

[luke]

nicole,

Simply put...CF is an obstructive disease, meaning there is a problem getting air out. FEV1 is used to determine the level/presence of obstruction. Hence that is what is used to determine.

The FVC is used to determine restrictive disease, abilty to get air in. Now this is where it gets a little confusing. CF also has a restrictive component that is caused by all of the "scarring" from frequent infections. So our FVC also is effected.

Long story short, the more air you get in the more air you "could" get out. But in order to judge our function FEV1 is the test the identifies our woes.

hope this helps

 

[luke]

nicole,

Simply put...CF is an obstructive disease, meaning there is a problem getting air out. FEV1 is used to determine the level/presence of obstruction. Hence that is what is used to determine.

The FVC is used to determine restrictive disease, abilty to get air in. Now this is where it gets a little confusing. CF also has a restrictive component that is caused by all of the "scarring" from frequent infections. So our FVC also is effected.

Long story short, the more air you get in the more air you "could" get out. But in order to judge our function FEV1 is the test the identifies our woes.

hope this helps

 

[LouLou]

Luke and Amy have explained it well. One other thing to know is that changes in your FEV1 show change in small airways. FEF 25-75 actually shows even smaller airways capabilities. To sum it up it's better to see changes as they come on slowly than to wait until theirs a big change like a majorly decreased FVC.

 

[LouLou]

Luke and Amy have explained it well. One other thing to know is that changes in your FEV1 show change in small airways. FEF 25-75 actually shows even smaller airways capabilities. To sum it up it's better to see changes as they come on slowly than to wait until theirs a big change like a majorly decreased FVC.

 

[LouLou]

Luke and Amy have explained it well. One other thing to know is that changes in your FEV1 show change in small airways. FEF 25-75 actually shows even smaller airways capabilities. To sum it up it's better to see changes as they come on slowly than to wait until theirs a big change like a majorly decreased FVC.