Some people tested as blood type O are actually weak A or weak B

Here is one example:

Seventeen weak subgroup discrepancies were found in 86,687 donors units tested, making an overall incidence of 1:5,100 donors or 0.02%. Correct blood typing and labeling of an individual as donor and as a recipient is essential to prevent ABO incompatibility in case of weaker subgroups of A and B.

More here:

Importance of Weak ABO Subgroups


One Comment

  1. moira July 10, 2017

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