Submitted by Novel_Estimate_3845 t3_xyllm9 in askscience
england_man t1_irkabfv wrote
Reply to comment by rmlmr-98 in When did blood type AB first evolve? by Novel_Estimate_3845
>I am wondering if blood type compatibility is always enough when it comes to donations?
No.
ABO is the most important compatibility factor, and second is Rh factor (rhesus factor, either positive or negative). Beyond that, there are many other antigen groups that may affect the transfusion.
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