Experimental Factor Ontology term EFO_0009214 (Hemoglobin Barts to Total Hemoglobin Ratio Measurement) is the determination of the ratio of hemoglobin Barts compared to total hemoglobin present in a sample. The measurement may be expressed as a ratio or percentage. [ NCI ]. Also known as: HBBARTHB, Hemoglobin Barts/Total Hemoglobin.