We observed a case with delayed hemolytic transfusion reaction due to anti-Jra which had not been detected in her pretransfusion serum. She was transfused with 4 units of blood, which was judged to be compatible with crossmatch test. The immediate posttransfusion period was uneventful. Three days later, she developed a slight fever and hypertension with decreasing blood level, but these symptoms disappeared without special treatment after several hours. Anti-Jra could be identified in both her serum and the eluate from her red cells 8 days after transfusion. Anti-Jra in the serum gradualy decreased with its half life of about 20 days.
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Yoshida et al. (1991) studied this question.
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