title: The differentiation of delayed serologic and delayed hemolytic transfusion reactions: incidence, long-term serologic findings, and clinical significance.
abstract: Delayed serologic transfusion reactions (DSTRs) and delayed hemolytic transfusion reactions (DHTRs) were studied in a large tertiary-care hospital. A DSTR was defined by the posttransfusion finding of a positive direct antiglobulin test (DAT) and a newly developed alloantibody specificity. A DHTR was defined as a DSTR case that showed clinical and/or laboratory evidence of hemolysis. Thirty-four cases of DSTR, 70 percent of which were due to anti-E and/or -Jka, were documented prospectively over a 20-month period. Retrospective review of the medical records found clinical evidence of hemolysis in only 6 (18%) of the 34. Thus, the incidence of DSTR was 1 (0.66%) of 151 recipients with posttransfusion samples available for testing, whereas the incidence of DHTR was only 1 (0.12%) of 854 patients tested. Fifteen of the 34 patients were followed for up to 174 days after reaction. Twelve of the 15 still demonstrated a positive DAT with anti-IgG only. Eluate studies indicated that the persistence of a positive DAT after DSTR or DHTR may involve several immunologic mechanisms, including the development of posttransfusion autoantibodies. This study indicates 1) that DSTRs are a frequent finding in multiply transfused patients, although most cases are benign and fail to meet rigid criteria for DHTR, and 2) that the persistence of a positive DAT after DSTR or DHTR is common.
authors.affiliation: Johns Hopkins Hospital Blood Bank, Baltimore, Maryland.
authors.forename: P M
authors.initials: PM
authors.lastname: Ness
authors.forename: R S
authors.initials: RS
authors.lastname: Shirey
authors.forename: S K
authors.initials: SK
authors.lastname: Thoman
authors.forename: S A
authors.initials: SA
authors.lastname: Buck
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000936:Antigen-Antibody Complex; D002648:Child; D005260:Female; D006461:Hemolysis; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D012698:Serologic Tests; D013997:Time Factors; D065227:Transfusion Reaction
chemical_list: D000936:Antigen-Antibody Complex