serum carboxyhemoglobin level 2010-06-25T10:33:13Z A measure of the amount of carboxyhemoglobin formed by the combination of carbon monoxide and hemoglobin in a specified volume of serum, the clear liquid that separates from blood after it has clotted completely, i.e. blood plasma from which fibrinogen has been removed. CMO:0000284 blood carbon monoxide level clinical_measurement_ontology mshimoyama serum carboxyhaemoglobin level blood carboxyhemoglobin level