hgb dl transfusion hemoglobin days blood allowed prior rbc criteria 
gm hemoglobin dl hgb transfusion creatinine days si equal prior 
transfusions hemoglobin dl hgb allowed receive blood days permitted permissible 
transfusion meet inclusion blood allowed criteria mm count hb neutrophil 
hgb hemoglobin dl days anemia starting gr mg therapy treatment 
transfusion hemoglobin dl permitted days blood prior administration past preceding