Question

Why is blood type AB+ considered the universal receiver?

Answer 1

AB+ blood group is considered as the universal receiver because it has no antibodies that can attack the antigens on the red blood cells of the other blood types.

Further Explanation:

The blood group system (ABO) in human beings is classified by the availability of a particular antigen present on the red blood corpuscle. The presence of allele IBi or IAi helps in classifying whether the antigen B or A is attached to RBCs. If the allele iO is present, that means no antigen is attached.

Thus, the table represents the present of the allele in different blood group:

Blood group Genotype Antigen present on red blood cell

A IAIA or IAi A

B IBIB or IBi B

O ii A and B

AB IAIB none

The A (blood group) has only A antigen and B (blood group) has only B antigen. The blood group AB has B and A antigens present on the RBC. Any infusion between the B and A blood group is not possible due to the production of specific antibody against the antigen by the body. Whereas, the AB blood group consist of both B and A antigen thus it can accept A, B and O blood group. It has not antibody that can attack. Thus, an individual with AB blood group is a universal receiver.

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Answer Details:

Grade: High School

Subjects: Biology

Topic: Blood transfusion  

Keywords:

Blood group, red blood cell, universal receiver, antigen, antibody, availability, accept, body, individual, specific.

Answer 2

Well, there are four main blood types with two variations of each (so 8 in all):
A+
A-
B+
B-
AB+
AB-
O+
O-
Now, A blood has the presence of the A antigen in it, and so it can't mix with B blood (most of the time).
B blood has the B antigen.
AB has BOTH antigens in it
O has no antigen whatsoever.
So if AB has both antigens, wouldn't it be able to receive antigens from A and/or antigens from B? And same with O, which has no antigens, which has no effect on whatever type of blood it's introduced in (which is why O is considered "the universal donor").
Now, the difference between + & - is simple, and has almost no impact on a person. If a person has +, they have Rh in their blood (it's another type of antigen), and if a person has -, the Rh factor isn't there. So if a person has positive, they have Rh, so more Rh blood can be added to it, and so can blood without the presence of Rh.
Hope this helps!