In this study, the authors would like to establish the guideline for effective utilization of blood and blood components in various elective surgeries. We investigated the amount of tansfused blood and blood components units, C/T ratio (crossmatching to transfusion ratio), disused rate of blood ordered in 861 elective surgery cases during the period from October I990 to September 1991. overall mean units of transfusional units per patient were 5.3 units and overall C/T ratio was 1.14. Of all the transfusional units the ratio of whole blood was 51.5%, packed red blood cell was 7%, fresh frozen plasma was 41% respectively. From this study, the guideline for the optimal blood ordering for each elective surgery was made.