Absence of DOMR, a new antigen in the Dombrock blood group system that weakens expression of Do(b) , Gy(a) , Hy, Jo(a) , and DOYA antigens.

Background: The Dombrock (Do) blood group system consists of six distinct antigens: Do(a) , Do(b) , Gy(a) , Hy, Jo(a) , and DOYA. Our finding of a pregnant patient whose red blood cells (RBCs) were Hy+ but whose serum contained an apparent alloanti-Hy suggested the presence of a seventh antigen and prompted this study.

Study Design And Methods: Standard hemagglutination and polymerase chain reaction-based methods were used throughout.

An alloantibody to a high-prevalence MNS antigen in a person with a GP.JL/Mk phenotype.

The low-prevalence MNS blood group antigenTSEN is located at the junction of glycophorin A (GPA) to glycophorin B (GPB) in several hybrid glycophorin molecules. Extremely rare people have RBCs with a double dose of the TSEN antigen and have made an antibody to a high-prevalence MNS antigen. We report the first patient who is heterozygous for GYP.

Molecular basis of two novel high-prevalence antigens in the Kell blood group system, KALT and KTIM.

Background: The Kell blood group system consists of 25 antigens that result from single-nucleotide polymorphisms. Most polymorphic Kell antigens reside on the N-terminal domain of Kell before the zinc-binding catalytic motif, which is the major site for endothelin-3-converting enzyme activity. Kell antigens are important in transfusion medicine owing to their strong immunogenicity, and the corresponding antibodies are clinically significant.

Cefotetan-induced immune hemolytic anemia following prophylaxis for cesarean delivery.

Second- and third-generation cephalosporins, notably cefotetan, are increasingly implicated in severe, sometimes fatal immunemediated hemolytic anemia. We describe a 26-year-old woman who developed severe hemolytic anemia 2 weeks after receiving a single prophylactic dose of cefotetan during cesarean delivery. The patient's DAT was weakly reactive for IgG and her serum reacted with cefotetan-coated RBCs.

DAK, a new low-incidence antigen in the Rh blood group system.

Background: Some low-incidence antigens in the Rh blood group system (e.g., VS, Rh32, FPTT) are expressed by more than one Rh complex.