That would make him AB+ because that includes every protein. But if he has any AB+ blood in him, he would test as AB+. The same would be true if he had A, B and at least one positive as the test is only to see if the protein is there, not if some blood cells are missing the protein.
That would make him AB+ because that includes every protein. But if he has any AB+ blood in him, he would test as AB+. The same would be true if he had A, B and at least one positive as the test is only to see if the protein is there, not if some blood cells are missing the protein.