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.
350 ml in 5 min
500 ml in 5 min
1 Litre in 5 min
Whole blood volume