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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 capapcity (EVC)
Inspiratory vital capacity (IVC)
Breathing frequency rate (FR)
Inspiratory time (Ti)
E
xpiratory time (Te)
Ti as a % of total breath time (Ti/Ttot)
Tidal volume as a % of Ti (TV/Ti)
Tests per subject: 5 VC manoeuvre
8 FVC manoeuvres
Predicted Values: Various – depends upon national
preference
Transducer: CareFusion Bi-Directional Digital Volume.
Resolution: 10ml volume 0.03l/s flow
Accuracy: +/-3%. To ATS recommendations –
Standardisation of spirometry 1994
update for flows and volumes.
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