FCOHb[1] Carboxyhemoglobin
FCOHb is the fraction of total hemoglobin (ctHb) which is present as carboxyhemoglobin (COHb). By convention the fraction is expressed as a percentage (%).
In the range of 0 – 60 % COHb in arterial (COHb(a)) and venous blood (COHb(v)) is similar, i.e. either venous or arterial blood may be analyzed [1]. In most medical texts FCOHb(a) is referred to as simply COHb. [2]
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The COHb parameter is measured on these ABL blood gas analyzers:1. Lopez DM, Weingarten-Arams JS, Singer LP, Conway EE Jr. Relationship between arterial, mixed venous and internal jugular carboxyhemoglobin concentrations at low, medium and high concentrations in a piglet model of carbon monoxide toxicity. Crit Care Med 2000; 28: 1998-2001. 2. Acute care testing handbook. Radio...