Your FEV1 is between 30% and 49% of the normal predicted values, and your FEV1/FVC is less than 70%. In this stage, you may experience shortness of breath, fatigue, and a lower tolerance to ...

Therefore, the forced expiratory volume in one second (FEV1) should be around three-quarters of the FVC. This gives an FEV1:FVC ratio (FEV1/FVC or FEV1%) of around 0.75 or 75% (Miller, 2008). Fig 1 ...

Let's take a look at what abnormal values for these tests mean. ... Stage 3: This is when your FEV1 is between 30% to 49% of the normal and your FEV1/FVC ratio is less than 70%.

Results Pulmonary function tests were evaluated from 311 athletes, across 20 Olympic and 13 paralympic sports (48% female, mean +/- SD age: 25 ± 5 years). Supra-normal FEV1 and FVC values were ...

Normal physiology (forced expiratory volume in 1 second [FEV1]/forced vital capacity [FVC] ratio ≥ 0.70 and FVC ≥ 80% of the predicted value). Obstructive physiology (FEV1/FVC ratio < 0.70 ...

Additionally, positive predictive value of the tool was 99% for identifying quantifiable FEV1 values and a recall value of 100%. For 95% of cases, the tool was able to correctly identify FEV1 ...

Therefore, the forced expiratory volume in one second (FEV1) should be around three-quarters of the FVC. This gives an FEV1:FVC ratio (FEV1/FVC or FEV1%) of around 0.75 or 75% (Miller, 2008). Fig 1 ...