Abnormal hemoglobin HbH hemoglobin 2012-06-03T04:59:15Z Hemoglobin H HP:0011903 HbH haemoglobin Hemoglobin H (HbH) contains four beta-globin chains. It is normally not present at all in blood, but may make up about 1-40 percent of all hemoglobin in HbH disease, a subform of alpha thalassemia. SNOMEDCT_US:48553001 Haemoglobin H UMLS:C3161174