Question

how doctor understand our blood group is A+ orB+ etc

Answer 1

presence of antigen or rh antigen is +veand absence is termed as-ve

Answer 2

Hi friend..
Here is your answer

Please have a look on MÝ answer


ANSWER

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The Different Blood Types

There are four major blood groups and eight different blood types. Doctors call this the ABO Blood Group System.

The groups are based on whether or not you have two specific antigens -- A and B:

● Group A has the A antigen and B antibody.

● Group B has the B antigen and the A antibody.

● Group AB has A and B antigens but neither A nor B antibodies.

● Group O doesn’t have A or B antigens but has both A and B antibodies.


There’s also a third kind of antigen called the Rh factor. You either have this antigen (meaning your blood type is “Rh+” or “positive”), or you don’t (meaning your blood type is “Rh-” or “negative”). So, from the four blood groups, there are eight blood types:

● A positive or A negative

● B positive or B negative

● AB positive or AB negative

● O positive or O negative




I hope it will help
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