This study chose 530 patients among the total of 5214 operative cases except open heart and pediatric surgery who received more than 2 pints of blood who were performed general, spinal and epidural anesthesia. This study lated for a year in an operating room. We measured and compared the value of hemoglobin and hematocrit, preoperatively, in recovery room and 24 hours after operation. We also compared the volume of blood transfused with the volume of blood loss during the operation. The results are as follows. 1) According to the operative Department of the transfusion cases, the distributions were 129 cases(Obstetic & Cynecology), 114 cases(Orthopedic Surgery). 2) The mean values of hemoglobin measured preoperatively, in recovery room and 24 hours after operation were 11.9gm/dl, 11.5gm/dl and 11.6gm/dl, respectively. 3) In the comparison and observation about the difference of the hemoglobin value and hematocrit value preoperatively and in recovery room the cases which showed the difference of 10% were 229 cases which was the most frequent cases. The cases which showed the differences of 40% were 24 cases and it was the less frequent cases. 4) In the volume of blood loss on the operative department, maximum volum of blood loss was 4,130ml in hepatic primary closure. 5) In the comparison and observation of the volume of the blood transfusion, the cases whose volume of transfusion was 2~5pint were 430 cases. The cases in which more than 10 pints transfused were 25 cases. 6) In the operation where the patients transfused more than 10 pints of whole blood, vertebral interbody fusion was the most cases. 7) In the patients who transfused more than 10 point of whole blood, urticarias was whon 16 cases among 25 cases. 8) Recording the values of hemoglobin and hematocrit, preoperatively, in recovery room and 24 hours after operation on the blood trasfusion makes anesthesiologist precise to determine the volume of blood transfusion and blood loss. The results from all the cases were considered satisfactory except one case which showed the complication of pulmonary edema.