The reduction in FVC may, paradoxically, raise the FEV1/FVC. The full extent of airflow obstruction will be revealed by looking at the FEV1/VC and checking the graphs. Severe airflow obstruction will ...

Due to premature closing of the airways on expiration, the FVC will also decrease but not as much as the FEV1. The FEV1/FVC will fall. The flow/volume graph has a concave appearance (Fig 1). The ...

If a doctor suspects you have a lung condition, they’ll calculate your FEV1/FVC ratio. This represents the percentage of your lung capacity you can expel in one second.

There is significant disparity in the ratios for postbronchodilator FEV1/FEV6 and FEV1/FVC %, and this disparity is very pronounced in women.

FVC% and FEV1% thresholds that best separated hypercapnic from normocapnic patients were 56% and 33% of predicted values, according to cross-validation analysis.