<prompt> Testing of receipient cells against donor serum isMajor Cross MatchingMinor CrossmatchingDirect Coombs TestRh Group Matching  <response>: Answer- B. Minor CrossmatchingMinor cross-match: Recipient red cells are tested against donor serum to detect donor antibodies directed against a patients antigens.This is no longer required. It is assumed that the small amount of donor serum and antibodies left in a unit of packed cells will be diluted in a recipient 