6. Parameters ABL800 FLEX Reference Manual
List of equations, Continued
V(B)
(continued)
Eq. Description
42.1
(
)
VB()=
××−×
V
FF
(CO)
2.184 10 COHb(2) COHb(1) tHb
-2
c
42.2
V(CO) = volume (in mL) of carbon monoxide injected according to the
procedure and the value keyed-in.
42.3
FCOHb(1) = fraction of COHb measured before the CO injection
42.4
FCOHb(2) = fraction of COHb measured after the CO injection
Anion Gap,K
+
Eq. 43:
Anion Gap, K Na K Cl HCO
+
=+−−
++ −
cccc
3
−
−
Eq. 44:
Anion Gap
Anion Gap Na Cl HCO
3
=−−
+−
ccc
cCa
2+
(7.4)
Eq. 45 Ref. [12]:
)
[]
ccCa Ca pH
22
74 1 053 740
++
=−×−(.) . .
Due to biological variations this equation can only be used for a pH value in the
range 7.2 - 7.6.
See Oxyhemoglobin dissociation curve (ODC).
Eq. 46-47
Eq. 48:
mOsm
GluNa2Osm ccm +=
+
FHbF Eq. 49:
An iterative method is used to calculate FHbF. The input parameters are sO
2
, ceHb
(effective hemoglobin concentration), and cO
2
HbF (concentration of fetal oxyhe-
moglobin).
In the calculations the following are assumed: pH = 7.4, pCO
2
= 5.33 kPa, FCOHb
= 0, FMetHb = 0, cDPG = 5 mmol/L, and temp = 37 °C.
Step Description See…
1.
An estimate of FHbF is made: FHbF
est
= 0.8
2.
pO
2
,
est
= ODC (sO
2
,A,T); Eq. 47
where the constant A depends on FHbF = FHbF
est
Continued on next page
6-40
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