ABL800 FLEX Reference Manual 6. Parameters
Derived parameters
In the Type column the following symbols are used:
General
information
• ms
for measured parameters
• dv
for derived parameters
Acid-Base
derived
parameters
Symbol Definition Type Eq.
pH(T) pH of blood at patient temperature. dv
1
cH
+
(T) Concentration of hydrogen ions in blood at
patient temperature.
dv
2
pCO
2
(T) Partial pressure (or tension) of carbon dioxide at
patient temperature.
dv
3
cHCO
3
–
(P) Concentration of hydrogen carbonate in plasma
(also termed actual bicarbonate).
dv
4
cBase(B)
or ABE
Actual Base Excess, the concentration of titrable
base when the blood is titrated with a strong base
or acid to a plasma pH of 7.40, at pCO
2
of
5.33 kPa (40 mmHg) and 37
o
C, at the actual
oxygen saturation [4,5].
Positive values (base excess) indicate a relative
deficit of noncarbonic acids; negative values
(base deficit) indicate a relative excess of non-
carbonic acids.
dv
5
cBase(B,ox) cBase(B) of fully oxygenated blood. dv
6
cBase(Ecf)
or SBE
Standard Base Excess, an in vivo expression of
base excess [5, 6]. It refers to a model of the
extracellular fluid (one part of blood is diluted by
two parts of its own plasma) and is calculated
using a standard value for the hemoglobin
concentration of the total extracellular fluid.
dv
7
cBase(Ecf,ox) cBase(Ecf) of fully oxygenated blood. dv
8
cHCO
3
–
(P,st) Standard Bicarbonate, the concentration of
hydrogen carbonate in the plasma from blood
which is equilibrated with a gas mixture with
pCO
2
= 5.33 kPa (40 mmHg) and
pO
2
≥ 13.33 kPa (100 mmHg) at 37
o
C [4,5].
dv
9
ctCO
2
(P) Concentration of total carbon dioxide, (free CO
2
+ bound CO
2
) in plasma.
dv
10
Continued on next page
6-17
To Next Page
Loading...
Need help?
General
