<P> Table note 1 . Assumes absence of strong atypical antibodies in donor plasma </P> <P> Rh D antibodies are uncommon, so generally neither D negative nor D positive blood contain anti-D antibodies . If a potential donor is found to have anti-D antibodies or any strong atypical blood group antibody by antibody screening in the blood bank, they would not be accepted as a donor (or in some blood banks the blood would be drawn but the product would need to be appropriately labeled); therefore, donor blood plasma issued by a blood bank can be selected to be free of D antibodies and free of other atypical antibodies, and such donor plasma issued from a blood bank would be suitable for a recipient who may be D positive or D negative, as long as blood plasma and the recipient are ABO compatible . </P> <P> In transfusions of packed red blood cells, individuals with type O Rh D negative blood are often called universal donors . Those with type AB Rh D positive blood are called universal recipients . However, these terms are only generally true with respect to possible reactions of the recipient's anti-A and anti-B antibodies to transfused red blood cells, and also possible sensitization to Rh D antigens . One exception is individuals with hh antigen system (also known as the Bombay phenotype) who can only receive blood safely from other hh donors, because they form antibodies against the H antigen present on all red blood cells . </P> <P> Blood donors with exceptionally strong anti-A, anti-B or any atypical blood group antibody may be excluded from blood donation . In general, while the plasma fraction of a blood transfusion may carry donor antibodies not found in the recipient, a significant reaction is unlikely because of dilution . </P>

Is o negative blood type a universal donor
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