Forward (Cell) Grouping
Reverse (Serum) Grouping
Group II - Discrepancies that are associated with unexpected or atypical reactions in the forward grouping, specifically mixed field reactions.
Most probable ABO type: Group A
Possible Causes: Weak subgroup of A, notably A3; weak results with mixed field reaction in the forward typing could be due to the transfusion of large quantities of O Red Blood Cells into a group A recipient, chimerism, or a group A patient transplanted with group O stem cells.
Some strategies for resolution: Obtain patient history including previous ABO typing results and transfusion history.