Massive blood transfusion is defined as -

Massive Blood Transfusion is defined as- According to Sabiston- . transfusion greater than patient's total blood volume in 24 hrs or as acute administration of more than 10 units of blood over a few hours. According to Schwartz- Massive transfusion is a single transfusion of 2500 ml or 5000 ml transfused over a period of 24hrs.