Abstract:
BACKGROUND:By consensus definition, the red blood cells (RBCs) of patients that react weak to 2+ in the serologic D test are classified as having the serologic weak D phenotype (weak D). The risk of D alloimmunization in patients with weak D is not well studied. This study retrospectively determined the incidence of D alloimmunization in patients with weak D who received D+ blood products. STUDY DESIGN AND METHODS:Patient records at four institutions were reviewed. Eligible patients had at least 1 D typing result with agglutination strength that was weak to 2+ result in gel or tube (Institutions 1-3) or weak to 2+ result in solid phase or a positive tube weak D test using antihuman globulin reagent (Institution 4). All patients received at least 1 D+ allogeneic RBC or platelet transfusion and had a subsequent antibody detection test performed at least 30 days after the first D+ transfusion. RESULTS:The incidence of alloanti-D formation was 0.15% (6/4011, at Institutions 1-3) and 5.1% (3/59, at Institution 4; these incidences were significantly different [p = 0.0002]). There were 0.15% (6/4011) patients who had autoanti-D detected; all were at Institutions 1 to 3. CONCLUSIONS:Until RHD genotyping is widely available, these data support the fact that patients with serologic weak D may be transfused with D+ RBCs if an urgent transfusion is required. At Institution 4, inclusion of a higher proportion of black patients compared to the other institutions may have affected the incidence of alloimmunization by perhaps including partial D recipients who are at risk of forming D antibodies.
journal_name
Transfusionjournal_title
Transfusionauthors
Yazer MH,Brunker PA,Bakdash S,Tobian AA,Triulzi DJ,Earnest V,Harris S,Delaney Mdoi
10.1111/trf.13725subject
Has Abstractpub_date
2016-10-01 00:00:00pages
2502-2509issue
10eissn
0041-1132issn
1537-2995journal_volume
56pub_type
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