# What is normal FEV1 in mL?

## What is normal FEV1 in mL?

Spirometry measures two key factors: expiratory forced vital capacity (FVC) and forced expiratory volume in one second (FEV1)….FEV1 measurement.

Percentage of predicted FEV1 value Result
80% or greater normal
70%–79% mildly abnormal
60%–69% moderately abnormal
50%–59% moderate to severely abnormal

## What is the normal range of FEV?

Normal Values of Pulmonary Function Tests

Pulmonary function test Normal value (95 percent confidence interval)
FEV1 80% to 120%
FVC 80% to 120%
Absolute FEV1 /FVC ratio Within 5% of the predicted ratio
TLC 80% to 120%

What is normal lung volume?

Lung capacity or total lung capacity (TLC) is the volume of air in the lungs upon the maximum effort of inspiration. Among healthy adults, the average lung capacity is about 6 liters.

### What is a normal forced vital capacity?

Forced vital capacity: the maximum amount of air you can forcibly exhale from your lungs after fully inhaling. It is about 80 percent of total capacity, or 4.8 liters, because some air remains in your lungs after you exhale.

### What does fef25 75 mean?

Forced expiratory flow at 25 and 75% of the pulmonary volume (FEF25-75%) is defined as the mean forced expiratory flow during the middle half of the FVC and measures average flow rates on an FVC segment that includes flow from medium-to-small airways [4].

What is FEV in spirometry?

Topic Overview. Forced expiratory volume (FEV) measures how much air a person can exhale during a forced breath. The amount of air exhaled may be measured during the first (FEV1), second (FEV2), and/or third seconds (FEV3) of the forced breath.

## What are the 4 lung volumes?

Four standard lung volumes, namely, tidal (TV), inspiratory reserve (IRV), expiratory reserve (ERV), and residual volumes (RV) are described in the literature. Alternatively, the standard lung capacities are inspiratory (IC), functional residual (FRC), vital (VC) and total lung capacities (TLC).