For the purpose of effective utilization of donated blood with limited shelf life, the author investigated the transfusion data which were used for 778 patients who received 2,556 units of blood during the period from Jan. to Dec., 1988 in Pusan National University Hospital. The data were statistically studied and optimal guide line in elective surgery was established. The results were as follows. 1) In the period under study, transfusion ratio of each surgical department were from 37.6% to 83.6%. 2) Average CT ratio of elective surgical procedure was 1. 4 3) Number of crossmatched and transfused blood were about 4.7 units and 3.3 units by operating procedure in elective surgery, respectively. 4) The ratio of usage of blood component was 14.0%, and 120 of 778 transfused patients (15.4%) received a single unit transfusion. On the basis of these results and overviewed literature, it is summarized that established MSBOS & T & S order would be of value for decreasing in rate of outdating blood, overusage of blood, excessive crossmatching and laboratory costs.