Work out fev1 fvc ratio instantly with clear inputs, formula shown and shareable results.
Divides FEV1 by FVC, the ratio that separates obstructive from non-obstructive spirometry patterns.
FEV1/FVC
Ratio (%) = FEV1 / FVC x 100; the fixed GOLD cut-off for obstruction is 70%
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
GOLD uses a fixed 0.70 post-bronchodilator ratio; the lower limit of normal avoids over-diagnosis in older people.
No. A restrictive pattern shows a normal or high ratio with reduced FVC.