Massive transfusion is defined as either the transfusion of:
- 10 or more units of packed red blood cells in 24 hours; or
- "a sh*t ton" of packed red blood cells
This assumes, however, you can somehow figure out the paperwork to blood in the first place.[1][2][3] For more information, see Trauma-Associated Severe Hemorrhage Score or Assessment of Blood Consumption Score.
References