What type of blood is universal donor and why?

Answer 1

type O+

Answer 2

If someone with an A blood type is given blood from a B donor, the recipient's blood will react with the antigens in the B blood, rejecting the transfusion and triggering a transfusion reaction. O blood, however, can be safely given to someone with an A blood type, because there are no antigens in the donor blood to react with the recipient's body.

However, things get a bit more complicated than that, as the "+" and "-" symbols you are probably used to seeing after blood types would suggest. The ABO blood typing system can be further classified with the use of the Rhesus blood group system. Blood types under this system are determined by testing for A and B antigens, and looking for something called the Rhesus or Rh factor. If the Rh factor is present, the blood is "positive," and if it is not, the blood is "negative."

When the two systems are combined, you get a plethora of blood types: A-, A+, B-, B+, AB-, AB+, O-, and O+. As you might imagine, this complicates matters, because the presence of the Rh factor can cause a transfusion reaction in someone with a negative blood type, making it unsafe, for example, for B+ blood to be transfused into a B- recipient. When all eight of these blood types are considered as a group, only one blood type, O-, is totally nonreactive, making someone with O negative blood a universal donor. People with AB+ blood can take blood from anyone because their blood will not react with the Rh factor or the A and B antigens.

Answer 3

O negative is the universal donor. They do not have any of the antigens on their blood cells A, B, or Rh that cause people without those antigens to attack the blood cells.

Answer 4

blood group O are universal donor because they have no antigen.

Answer 5

Universal donor means they can donate to a person with any blood group.The blood group is O negative.