Packed red blood cells red cells with both are called AB. Except in unusual cases like infants or seriously immunocompromised individuals, all people will have antibodies to any ABO blood type that isn't present on their own red blood cells, and will have an immediate hemolytic reaction to a unit that is not compatible with their ABO type. In addition to the A and B antigens, there are rare variations which can further complicate transfusions, such as the Bombay phenotype. The Rh blood group system consists of nearly around 50 different antigens, but the one of the greatest clinical interest is the "D" antigen,
World Blood Donor Day 1868. World Blood Donor Day celebration brings a precious opportunity to all donors for celebrating it on national and global level as well as to commemorate the birthday anniversary of the Karl Landsteiner (a great scientist who won the Nobel Prize for his great discovery of the ABO blood group system). The theme for Blood Donation Day in 2018 is 'Be there for someone else. Give blood. Share life' The theme for Blood Donation Day in 2017 focus on blood donation in emergency situations. The first response when an emergency happens is "What Can You Do?" and the answer is