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Detection of anti-D in D- recipients transfused with D+ red blood cells.

Transfusion 2007 December
BACKGROUND: The D antigen is highly immunogenic, requiring only a small quantity of transfused red blood cells (RBCs) to cause alloimmunization in D- immunocompetent recipients. The relatively low sensitization rate in oncology patients transfused with D+ platelets is well documented. A study of the alloimmunization rate of primarily nononcology D- recipients transfused with D+ RBCs was undertaken.

STUDY DESIGN AND METHODS: Transfusion service records were examined to identify D- recipients who were not alloimmunized to the D antigen and who had a follow-up antibody screen performed at least 10 days after the initial D+ RBC transfusion(s). The age and sex of the recipients, date and number of D+ RBC transfusion(s) and their leukoreduction status, all subsequent serologic investigations, and the hospital ward where the units were issued were recorded.

RESULTS: There were 98 study-eligible recipients identified who received a total of 445 D+ RBC units. The mean follow-up length was 182 days. Most recipients (87%) had antibody screens performed more than 21 days after the initial D+ RBC transfusion. In total, 24 recipients made 44 new alloantibodies: 22 anti-D (22%), 11 anti-E, 5 anti-C, 2 anti-K, and 1 each of anti-Kp(a), anti-Jk(a), anti-Bg, and anti-Fy(b). The rate of anti-D alloimmunization among recipients of entirely leukoreduced D+ units was 13 percent (1/8). Reexposure to D+ RBCs after the initial bleeding episode did not increase the rate of alloimmunization.

CONCLUSIONS: The 22 percent rate of anti-D alloimmunization in patients requiring urgent RBC transfusion was intermediate between the rates previously reported for D- oncology patients transfused with D+ RBCs and that in immunocompetent volunteer recipients.

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