RESUMEN
One of the main indication of blood transfusion is to increase the transport of oxygen to tissue. Blood may be affected by storing. Sixty patients elected for major operations under general anesthesia was divided into 2 groups, 30 patients in each group. The patients of the 1st group aged 25-35 years, the patients of the 2nd group aged 65-75 years. Each group was subdivided into 2 subgroups, 15 patients in each. All patients received blood transfusion which was fresh in one subgroup and stored in the other. The bleeding time, clotting time, platelet count, prothrombin time, partial thromboplastin time, oxygen saturation and PH were measured. The results of this study showed that fresh blood tranfusion is more benifical than stored blood specially in geriatric patients