Chapter 4: T
echnical Specifications
The Spirometry Source
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The specifications given below are applicable in each
case, depending on the model available, as indicated in
detail in Section 1.3 SPIROMETER MODELS.
4.1 TYPES OF TEST, FUNCTIONS AND
PARAMETERS
FORCED VITAL CAPACITY FVC
Parameters:
• FVC
(l)
Forced Vital Capacity
• FEV.5
(l)
Forced Expiratory Volume in .5
seconds
• FEV1
(l)
Same in 1 second
• FEV3
(l)
Same in 3 seconds
• FEV.5/FVC (%)
Ratio
• FEV1/FVC (%)
Ratio
• FEV3/FVC (%)
Ratio
• FEV1/VC
(%)
Ratio
• PEF
(l/s) Peak Expiratory Flow
• FEF25%
(l/s) Forced Expiratory Flow 25% into
the maneuver
• FEF50%
(l/s) Same, 50% into the maneuver
• FEF75%
(l/s) Same, 75% into the maneuver
• FEF25-75% (l/s) Mean expiratory flow between 25%
and 75% of the FVC
• FEF75-85% (l/s) Mean flow between 75-85% of FVC
• FET25-75
(s)
Forced expiratory time between 25-
75% of FVC
• FET100
(s)
Forced Expiratory Time
•
MEF50/MIF50
(-)
Ratio
• FEV1/FEV.5 (-)
Ratio
• FEV1/PEF
(-)
Ratio