Medica EasyStat - Calculated Parameters

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, PCO
2
, PO
2
, and entered (or
default) Hb and FIO
2
are applied to the subsequent equations:
TCO
2
The following equation is used to calculate the total carbon
dioxide concentration
1
:
TCO
2
= [HCO
3
-
] + 0.0307 PCO
2
where: TCO
2
and HCO
3
-
are expressed in mmol/L
PCO
2
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.