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Blood Type

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Blood Type

Postby Maruko » Wed Aug 13, 2008 7:57 pm

Hi,

I don't understand why a person with type A can donate blood to type A or AB ppl, but receive blood from type A or O ppl. Here are my questions:

1) Since type A ppl have antigen A on their red blood cells and anti-B antibodies, when they donate their blood to type AB ppl, wouldn't the anti-B antibodies bind to the B antigen on the AB red blood cells and agglutinate?

2) When a type A person receives blood a type O person, since the type O has anti-A and anti-B antibodies, wouldn't the anti-A antibodies bind to the antigen A on the red blood cell and agglutinate?

3) When we are donating blood, are we donating only the red blood cell (with antigen on it) and no antibodies?

Thanks in advance!

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Postby MisterATP » Wed Aug 13, 2008 9:32 pm

I answer just in your first question. I think that will be enough.

Yes, you are right saying that anti-B antibodies bind to B antigen on the AB red blood cells. Say, the donor of type A gives 1 liter a blood. The concentration of anti-B antibodies is pretty small in 1 liter of blood that would be triggered dangerous an agglutination. Clear?
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Re: Blood Type

Postby Maruko » Thu Aug 14, 2008 12:58 am

Thank you so much, MisterATP!
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