Patients that do not have a valid Ontario Health Insurance Plan (OHIP) number at time of first transfusion
Patients that require emergent release of a RBC transfusion and in whom emergency randomization could not be completed
Patients with complex antibody profile in which it is impossible to match RBC units

NCT03344887_exc_T1
Observation
have a valid Ontario Health Insurance Plan (OHIP) number
NCT03344887_exc_T2
Negation
not
NCT03344887_exc_T3
Temporal
at time of first transfusion
NCT03344887_exc_T4
Reference_point
first transfusion
NCT03344887_exc_T5
Procedure
transfusion
NCT03344887_exc_T6
Multiplier
first
NCT03344887_exc_T7
Procedure
RBC transfusion
NCT03344887_exc_T8
Procedure
emergency randomization
NCT03344887_exc_T9
Qualifier
emergent release
NCT03344887_exc_T10
Mood
require
NCT03344887_exc_T11
Negation
could not be completed
NCT03344887_exc_T12
Condition
complex antibody profile
NCT03344887_exc_T13
Observation
impossible to match RBC units