Welch Allyn Schiller AT-2plus - Explanation of Measured Values; Spirometry Measurement Definitions

AT-2plus User Guide Spirometry Supplement Page 24
AT-2plus Spirometry Supplement Page 24
Explanation of Measured Values
FVC Forced (expiratory) Vital Capacity. Volume achieved by the quickest possible exhalation after a maximal
inhalation.
FEV
0.5/1.0/3.0
Forced expiratory volume. Lung volume in litres, measured after 0.5, 1.0 or 3 seconds forced expiration.
FEF Forced Expiratory Flow Respiratory. Flow in terms of differing lung volumes measured in litres per second.
FEF
25-75%
flow speed of the expired air by 25 to 75% of the forced vital capacity (FVC).
FEF
75-85%
flow speed of the expired air by 75 to 85% of the forced vital capacity (FVC).
FEF
25%
flow speed of the expired air by 25% of the forced vital capacity (FVC).
FEF
50%
flow speed of the expired air by 50% of the forced vital capacity (FVC).
FEF
75%
flow speed of the expired air by 75% of the forced vital capacity (FVC).
FEF
.2-1.2
averaged flow between 0.2 and 1.2 litres of the forced expired vital capacity.
PEF Peak Expiratory Flow.
MEF Maximal Expiratory Flow.
MEF
75%
flow speed of the expired air by 25% of the forced vital capacity (FVC).
MEF
50%
flow speed of the expired air by 50% of the forced vital capacity (FVC).
MEF
25%
flow speed of the expired air by 75% of the forced vital capacity (FVC).
MEF
75%
= FEF
25%
MEF
50%
= FEF
50%
MEF
25%
= FEF
75%
Explanation of Measured Values
FVC Forced (expiratory) Vital Capacity. Volume achieved by the quickest possible exhalation after a maximal
inhalation.
FEV
0.5/1.0/3.0
Forced expiratory volume. Lung volume in litres, measured after 0.5, 1.0 or 3 seconds forced expiration.
FEF Forced Expiratory Flow Respiratory. Flow in terms of differing lung volumes measured in litres per second.
FEF
25-75%
flow speed of the expired air by 25 to 75% of the forced vital capacity (FVC).
FEF
75-85%
flow speed of the expired air by 75 to 85% of the forced vital capacity (FVC).
FEF
25%
flow speed of the expired air by 25% of the forced vital capacity (FVC).
FEF
50%
flow speed of the expired air by 50% of the forced vital capacity (FVC).
FEF
75%
flow speed of the expired air by 75% of the forced vital capacity (FVC).
FEF
.2-1.2
averaged flow between 0.2 and 1.2 litres of the forced expired vital capacity.
PEF Peak Expiratory Flow.
MEF Maximal Expiratory Flow.
MEF
75%
flow speed of the expired air by 25% of the forced vital capacity (FVC).
MEF
50%
flow speed of the expired air by 50% of the forced vital capacity (FVC).
MEF
25%
flow speed of the expired air by 75% of the forced vital capacity (FVC).
MEF
75%
= FEF
25%
MEF
50%
= FEF
50%
MEF
25%
= FEF
75%