hbac glycosylated hemoglobin glucose diabetes measurement met poorly screening intolerance ac hemoglobin hgb diabetes uncontrolled defined glycosylated hb poorly controlled glucose fasting mg dl diabetes blood serum mellitus uncontrolled random mellitus diabetes insulin poorly controlled induced dependent steroid history hbac glucose mellitus diabetes closely antidiabetic dm monitored adjusted hbac necessary haemoglobin dl transfused hb glycated hematology hbac haematological platelet anc hbac ac hemoglobin glucose diabetes glycated mellitus fasting poorly controlled glucose fasting mmol plasma mg dl fpg hbac diabetes type