Anatomy General anatomy eb54abb4 Massive blood transfusion is defined as A 500 ml in 10 min B 250 ml in 5 min C 1 unit in 1 hour D 2500 ml or 5000 ml in 24 hours High-Yield Explanation According to Schwaz Massive transfusion is a single transfusion of 2500 or 5000 ml over a period of 24 hours .