blood groups


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blood groups

See ABO BLOOD GROUPS, KELL BLOOD GROUP SYSTEM and RHESUS FACTOR.

blood groups

classification of types of human blood, originally for defining compatibility for transfusion. ABO groups the four main types, named according to the antigens on the individual's red blood cells (RBC): A, B, AB (both) or O (none). (The donor's blood cells will be catastrophically hydrolysed if the recipient's plasma has antibodies to the donor cells' antigens.) An individual's blood plasma contains antibodies to whichever antigen(s) are not present on that person's own red blood cells; for example, group O (no antigens) can donate to a recipient of any group, because the recipient's plasma antigens can have no effect on the donor's red cells, and group AB (no antibodies) can receive from a donor of any group. Rhesus (Rh) blood groups the majority of people ('Rh positive') have another red blood cell antigen. There is no antibody to this in anyone's plasma, except when a person of the 'Rh-negative' minority has been exposed to the antigen. For example, a Rh-negative mother who has an Rh-positive baby raises antibodies that can harm a later Rh-positive fetus; likewise, a first transfusion with Rh-positive blood raises antibodies that react against a later one.

blood groups,

n.pl the division of blood into types on the basis of the compatibility of the erythrocytes and serum of one individual with the erythrocytes and serum of another individual. The groups are immunologically and genetically distinct.

Patient discussion about blood groups

Q. HIV - does it infect specific Blood Types? A friend of mine joined the army and they took him to an experiment and infected him with HIV. But he was not infected- he said because he has a certain blood type. Is this true?

A. HIV, as all other viruses need specific cells,s surface proteins which called receptors,in case of HIV these receptors are found in certain WBCs that known as T-helper cells which named as T4 cells. All humans have these T4 cells but some people lack the receptor that necessary for virus attachment and pentration of the cell which leeds to the inablity of the virus to cause infection and become a target for the immune system. But they c can infect other suseptable people.

Q. Is it true that people with different blood type should have different diets?

A. I myself believe that that theory was kind of "psychological" advise : if you believe on it, then you do it, then you will have positive result. But I agree with violet that there is still none appropriate study to prove that theory.
And by the way, what "eat diet according to your blood type" suggests most likely are full lists of healthy foods, so I do believe if you follow a healthy diet program (doesn't have to be blood-type-diet), you will have a healthy life indeed..
Stay healthy always..

Q. is it possible to change my blood type from ab to ab-?

A. not really no...i mean there's a possibility if you'll have bone marrow and liver transplant-
http://www.news.com.au/entertainment/story/0,26278,23106284-5007185,00.html

and immunologically there shouldn't be a problem, because the body will react to an addition of proteins but not the lack of them (Rh-). but i fail to see why you want to do that.

More discussions about blood groups
References in periodicals archive ?
O- is a universal blood group that can be used to treat any patient in an emergency so donations from this group are particularly valuable.
It's important to know your blood group A, B, AB or O, should you ever need an emergency blood transfusion to avoid a mismatch.
Wahlgren added that in Nigeria, for instance, more than half of the population belongs to blood group O, which protects against malaria.
Sometimes, one blood group is more in demand than the other, so I am hoping that donors registered with the centre can give us more of the O blood group," she added.
In 2013, the Swiss Red Cross scientists published in Transfusion Medicine Reviews its first study assessing the MassARRAY system's reliability and sensitivity for blood group genotyping a wide range of blood groups, including many rhesus variants.
O Positive is the most common blood group in Scotland, which means hospitals require more of this than any other.
Those with the rarest blood group, AB, are the most vulnerable - they are 23 per cent more likely to suffer from heart diseases than those with blood group O, reported BBC Health.
The analysis deepens a mystery surrounding the evolutionary history of the ABO blood system, and should prompt further research into why the different blood groups have persisted over time, Laure Segurel of the University of Chicago and colleagues report November 6 in the Proceedings of the National Academy of Sciences.
Though 'B' group showed slightly higher incidence of severe malaria, the [chi square]-test did not reveal significant difference compared to other blood groups ([chi square] = 1.
This finding raises questions about why humans developed different blood groups, Prasad said.
Today, there are more than 600 antigenic structures among the 30 defined blood groups (1).
It will allow surgeons to carry out a transplant procedure which overcomes the problem of them having different blood groups.