why a negative blood group person can not donate blood to a positive blood group person?? while a positive blood group person can donate to a negative blood group
2006-08-03 04:31:13 · 3 answers · asked by ani v 1 in Health ➔ General Health Care ➔ Other - General Health Care
You have it backwards... Rh negative people CAN donate to an Rh + person. BUT an Rh + person CANNOT donate to an Rh negative person.
I know it's confusing, let me try to explain.
Rh is a factor in the blood that they discovered in rhesus monkeys (thus the Rh).
The Rh system classifies blood as Rh-positive (having the Rh factor) or Rh-negative (missing the Rh factor).
People with Rh-positive blood can receive Rh-negative blood; but people with Rh-negative blood will have a transfusion reaction if they receive Rh-positive blood. This is called a transfusion reaction.
In a transfusion reaction the immune system of the person who has Rh negative blood will identify the donated + blood as a foreign invader and will try to destroy it. Transfusion reactions caused by mismatched Rh blood types can be serious.
But if a person has Rh + blood and receives a donation of negative blood, there is no Rh factor in it so there isn't the problem of the immune system trying to attack it.
2006-08-03 04:41:30 · answer #1 · answered by rhubarb3142 4 · 2⤊ 1⤋
the previous answer is fairly sturdy. Rh positve people have an antigen on their purple blood cells, often called type D. Rh unfavorable people do not have this antigen. at the same time as someone lacking a given any given blood type antigen (there ar more effective than 20), and recieves blood or a blood product with that antigen, they grow to be sensitized and improve an antibody to that antigen, any further exposre to that different antigen should be deadly. it is what makes O unfavorable blood the common donor, those with this blood type do not have antigens for A, B or Rh and therefore received't sensitize the different individual hostile to those varieties. the different Rh unfavorable blood varieties, A, B and A,B can purely donate to a positve of a similar ABO type.
2016-10-15 10:55:46 · answer #2 · answered by ? 4 · 0⤊ 0⤋
It depends on too many factors to give a brief answer that you'd be able to understand.
2006-08-03 04:36:04 · answer #3 · answered by sovereign_carrie 5 · 0⤊ 0⤋