6. Parameters ABL800 FLEX Reference Manual
Input parameters, Continued
p50(st)
Can also be a derived parameter.
Definition Partial pressure (or tension) of oxygen at half
saturation (50 %) in blood at standard conditions:
temperature = 37
o
C
pH = 7.40
pCO
2
= 5.33 kPa
FCOHb, FMetHb, FHbF set to 0
p50(st) may however vary due to variations in
2,3-DPG concentration or to the presence of
abnormal hemoglobins.
Input range/Unit mmHg; torr: 0.01 - 100.00
kPa: 0.001 - 13.332
Conversion
p(kPa) =0.133322 × p(mmHg; torr)
p(mmHg; torr) = (kPa)500638.7 p
FCOHb(1)
Definition The fraction of COHb measured before the CO-
injection.
Input range/Unit %: 0.0 - 100.0
fraction: 0.000 - 1.000
FCOHb(2)
Definition The fraction of COHb measured after the CO-
injection.
Input range/Unit %: 0.0 - 100.0
fraction: 0.000 - 1.000
6-16
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