ITC Avoximeter 4000 Whole Blood CO-Oximeter - Manual (Page 10)

ITC AVOXimeter 4000 Operator’s Manual
The measured values are used to calculate total hemoglobin (tHb) and percent oxyhemoglobin
ample, using the fractional method described below:
tHb) + (COHb)
saturation [%02Hb] of the s
(tHb) = (O
2
Hb) + (HHb) + (Me
(O
2
Hb) x 100
%O
2
Hb =
(tHb)
Oxygen content [O
2
Ct] of the sample is then calculated:
1.39 x tHb x % O
2
Hb
O
2
Ct =
100
where 1.39 is the amount of oxygen assumed to be carried by one gram of oxygenated
hemoglobin (Hϋfner’s Number). Depending on your facility protocols, the Hϋfner’s Number stored
in the ITC AVOXimeter 4000 can be set at any value in the range of 1.30 to 1.39 (see page 28).
Glossary of Abbreviation Equivalents
In some cases, the display screen of the ITC AVOXimeter 4000 does not show the most
commonly used format for a specific constituent’s abbreviation. Below is a glossary of
abbreviation equivalents to ensure that users fully understand each reading on the ITC
AVOXimeter 4000
display.
Constituent
AVOXimeter 4000
Display
Conventional
Equivalent
Total Hemoglobin tHb tHb
Fractional O
2
Saturation sO
2
SO
2
Oxygen Content O2Ct O
2
CT
Carboxyhemoglobin COHb COHb
Methemoglobin MetHb MetHb
Oxyhemoglobin Saturation %O
2
Hb %O
2
Hb
2