Fetal Hemoglobin Haemoglobin F Hb F MESH:D005319 The major component of hemoglobin in the fetus. This hemoglobin has two alpha and two gamma polypeptide subunits in comparison to normal adult hemoglobin, which has two alpha and two beta polypeptide subunits. Fetal hemoglobin concentrations can be elevated (usually above 0.5%) in children and adults affected by leukemia and several types of anemia. Sufficient Foetal Haemoglobin Hemoglobin F Request inclusion into NCIT below "Hemoglobin"/"Normal Hemoglobin", for completion sake. SCDO:0005446 HbF Fetal Haemoglobin Normal Hemoglobin