Medica EasyStat, Operator'S Manual

Page: 111 / 158

105
p r i n c i p l e s o f o p e r a t i o n
/
t h e o r y
r
Calculated Parameters
The following calculated results are reported by the EasyStat
analyzer. The measured pH, PCO2, PO2, and entered (or
default) Hb and FIO2 are applied to the subsequent equations:
TCO2
The following equation is used to calculate the total carbon
dioxide concentration
1
:
TCO2 = [HCO3
-
] + 0.0307 PCO2
where: TCO2 and HCO3
-
are expressed in mmol/L
PCO2 is expressed in mmHg
THb
The hemoglobin is calculated based on the following calcula-
tion
2
:
Hb = Hct/3
where: Hb is in g/dL and Hct is %
The hemoglobin calculation is an estimation based on a normal MCHC of
33.3%. The EasyStat hemoglobin estimation from samples with red cell dys-
crasia or hemoglobinopathies may vary significantly from hemoglobin mea-
sured by the cyanmethemoglobin method.