obtained via diagnostic tool has possible finding Hemoglobin Measurement Arterial Blood Gas Test Carboxyhemoglobin to Total Hemoglobin Ratio The ratio of carboxyhemoglobin compared to total hemoglobin present in a sample. The measurement may be expressed as a ratio or percentage. Carboxyhemoglobin/Total Hemoglobin Carboxyhemoglobin Saturation EFO:0009203 COHb Saturation Used term from existing ontology but will suggest they update their label and description to ours. Increased Carboxyhemoglobin Normal Carboxyhemoglobin Level