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The following list supplies definitions of the indices:
Indices
Definition
FVC Test
IVC
Inspiratory vital capacity (L)
FVC
Forced vital capacity (L)
FEV.5
Forced expiratory volume after 0.5 seconds (L)
FEV.5/FVC%
(FEV.5/F%)
Percentage FEV 0.5 of FVC (%)
FEV.75
(F.75)
Forced expiratory volume after 0.75 seconds (L)
FEV.75/FVC%
(F.75/F%)
Percentage FEV 0.75 of FVC (%)
FEV1
Forced expiratory volume after 1 second (L)
FEV1%
Percentage FEV1 of VC (%)
FEV1/FVC%
(FEV1/F%)
Percentage FEV1 of FVC (%)
FEV1/PEF%
(F1/PEF%)
Percentage FEV1 of PEF (%)
FEV3
Forced expiratory volume after 3 seconds (L)
FEV3/VC%
(FEV3%)
Percentage FEV3 of VC (%)
FEV 3/FVC%
(FEV3/F%)
Percentage FEV3 of FVC (%)
FEV6
Forced expiratory volume after 6 seconds (L)
PEF L/s
Peak expiratory flow (L/sec)
PEF L/min
Peak expiratory flow (L/min)
FEF0.2-1.2
(F0.2-1.2)
Mean forced expiratory flow in the volume interval
between 0.2 and 1.2 L of the test (L/sec)
FEF 25-75
(F2575)
Maximal mid expiratory flow: the mean FEF in the
time interval between 25% and 75% of the FVC
(L/sec)
FEF 25-75/FVC
(F2575/F%)
Percent FEF 25–75 of FVC (%)
FEF 75-85
(F7585)
Forced late expiratory flow: the mean FEF in the time
interval between 75% and 85% of the FVC (L/sec)
FEF 25
Forced expiratory flow at 25% of the FVC (L/sec)
FEF 50
Forced expiratory flow at 50% of the FVC (L/sec)