Service manual

IQmark Digital Spirometer Operation Manual
89
J. Spirometry Measurement Parameters Defined
FVC
FEV
0.5
FEV
1.0
FEV
3.0
FEV
6.0
FEV
1.0
/FVC
FEV
3.0
/FVC
FEV
1.0
/FEV
6.0
FEV
25%
FEV
50%
FEV
75%
FEV
25
-
75%
FEV
75
-
85%
FEV
200
-
1200
FEV
0.5
/FIV
0.5
PEF
FIVC
FIV
0.5
FIF
50%
PIF
Exp Time
V ext
.
MVV
MTV
RR
AT
AT%
VC
ERV
IRV
TV
Unless otherwise noted: Volumes (capacity) are expressed in Liters BTPS (L)
Flows are expressed in Liters per second BTPS (L/s)
AT – Air Trapping – Calculated if an accepted FVC and an accepted VC test is saved in the
same session. Displayed in Liters, it is the difference of the VC and the FVC.
AT% – Air Trapping Percentage – Calculated if an accepted FVC and an accepted VC test is
saved in the same session. Displayed as a percentage it is the difference of the VC and the
FVC divided by the VC.
FVC – Forced Vital Capacity – The total volume of air exhaled during a forced expiration
(maximally forced effort) starting from a position of full inspiration and ending at complete
expiration. Expiration must be made as forcefully and completely as possible. A decrease in
FVC is common to restrictive disorders and severe obstructive disease.
FEV
X
– Forced Expiratory Volume at X (0.5, 1.0, 3.0, 6.0) second(s) – The volume of air
exhaled during a set value of time. The FEV at the first second of the FVC maneuver is the
most common. Back extrapolation is used to determine the beginning of the FVC maneuver.
A decrease in the FEV
1
value is common in obstruction of large to mid-sized airways.
FEV
1.0
/ FVC – Ratio of the volume of air expired in one second to the total volume of air
expired during the FVC test. An obstruction can cause a decrease in this ratio.
FEV
3.0
/ FVC – Ratio of the volume of air expired in three seconds to the total volume of air
expired during the FVC test.
FEV
1.0
/ FEV
6.0
– Ratio of the volume of air expired in one second to the total volume of air
expired in six seconds during the FVC test.
FEF
XX%
– Forced Expiratory Flow where XX could be 25, 50 or 75. This is the expiratory
flow rate at a certain percentage of the total FVC.
FEF
25-75%
– Forced Expiratory Flow from 25% of expiration to 75% of expiration, the middle
half of the FVC. Also known as the MMEF (maximal mid-expiratory flow). Decreases can
be an indicator of early stages of lung disease.
FEF
75-85%
– Forced Expiratory Flow from 75% of expiration to 85% of expiration.
FEF
200-1200
– Forced Expiratory Flow from 200 ml of expiration to 1200 ml of expiration.
Mostly used in the European Union.
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