Micro Direct MicroLoop Operating Manual page 38

Forced inspiratory flow at 75% of inhaled volume (FIF75)
Forced expiratory flow at 50% of volume as a percentage of FIF50 (FEF50/FIF50)
The time taken between 25% and 75% of the forced expired volume (MET2575)
Forced Expiratory Time (FET)
Tidal Volume (TV)
Expiratory reserve volume (ERV)
Inspiratory reserve volume (IRV)
Inspiratory capacity (IC)
Expiratory Relaxed vital capacity (EVC)
Inspiratory vital capacity (IVC)
Breathing frequency rate (FR)
Inspiratory time (Ti)
Expiratory time (Te)
Ti as a % of total breath time (Ti/Ttot)
Tidal volume as a % of Ti (TV/Ti)
Breath Rate
Breathing Time
Volume Tidal
Expiratory Time – average time of expiration per
breaths in seconds
Inspiratory Time – average time of inspiration per
breath in seconds
Total Tidal Breath Time in Seconds
Ratio of Average Expiratory and Inspiratory Breaths
Average Time of Expiration per Breath as a ratio to
The Total Tidal Breath Time
Tests per subject:
Predicted Values:
Transducer:
Resolution:
Accuracy:
5 VC maneuver
8 FVC maneuvers
Various – depends upon national preference
CareFusion Bi-Directional Digital Volume.
10ml volume 0.03l/s flow
+/-3%. To ATS recommendations –
Standardization of spirometry 1994 update for
flows and volumes.
35
BR
B.T
VT
Te
Ti
TTOT=Ti + Te
Ti/Te
Ti/TTOT