RADIOMETER FLEX ABL90, Reference Manual

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8. Parameters ABL90 FLEX reference manual
8-34
Eq. 41:
 
2
HHb 1 O 1 COHb MetHb COHb MetHb F s F F F F       
If sO
2
is not measured, it will be calculated from equation 39.
If dyshemoglobins (FCOHb, FMetHb) are not known, they are set to the default
values.
Eq. 42 [5]:
 
(CO)
(B)
24 COHb(2) COHb(1) 0.91 tHb
V
V
F F c

   
Eq. Description
42.1
 
(CO)
(B)
21.84 COHb(2) COHb(1) tHb
V
V
F F 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
Eq. 43:
+
3
Anion Gap,K Na K Cl HCO c c c c
   
   
Eq. 44:
  
  
3
HCO Cl Na Gap Anion c c c
Eq. 45 [12]:
2 2 0.24(7.4 pH)
Ca (7.4) Ca 10 c c
   
 
Due to biological variations this equation can only be used for a pH value in the
range 7.2-7.6.
NOTICE: The formula is different from previous Radiometer analyzers. The
previous formula was an approximation of the current formula.
The change corresponds to 1% in the pH range 7.2-7-6.
See Oxyhemoglobin dissociation curve (ODC), further in this chapter.
Eq. 48 [25]:
Glu Na 2 Osm c c m  

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
oxyhemoglobin).
FHHb
V(B)
Anion Gap,K
+
Anion Gap
cCa
2+
(7.4)
Eq. 46-47
mOsm
FHbF