Subgroups of A

Question

Why may the presence of A subgroups cause ABO typing discrepancies?

More than one answer is correct. Please select all correct answers

There is no way to identify A1 subgroup.
A3 subgroup is so common that it may be mistaken for A2.
The A antigen may be so weak that the patient could be mistyped as group O.
The A antibody may be so weak that the patient could be mistyped as group O.
Anti-A1 antibody may be present in A2 patients.

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