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For a 6-point match they test the A, B, and DR markers. For a 10-point match they also test the C and DQ markers.
A 6/6 match from an unrelated donor might be turn out to be 6/10, 7/10, 8/10, 9/10, or 10/10 after further testing. But I suspect that a 6/6 match with a parent or sibling has a much higher probability of turning out to be a full 10/10 match.
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