Posted by: Penny | 2004/10/27

Rhesus positive

What does Rhesus positive mean?

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Our expert says:
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It describes whether or not you have the Rhesus factor, a protein on the surface of red blood cells. If you don't have the Rhesus factor, you're considered Rhesus-negative; if you have it, you're Rhesus-positive. Most people (about 85 per cent) are Rhesus-positive, though it varies by race. So you will be A Positive or B negative etc.

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Our users say:
Posted by: BloodBanker | 2004/10/28

The Rh factor is in no way linked to HIV AIDS.
There are no similarities.
There is a case of haemolytic disease of the newborn (HDN), where an Rh Neg Mother, may give birth to an Rh Pos baby (who has inherited the Pos factor from the father); however this is usually picked up in antenatal and postnatal testing and an injection (Anti-D immunoglobulin) is given to the mother. It usually arises after a second pregnancy of an Rh Neg Ma, carrying an Rh Pos Ba. Rh HDN is more severe than ABO HDN.

Counselling is not required and & the blood transfusion services, have the necessary resources to inform and support the clinician, managing the patient.

I would be most glad to write a short article on HDN, with the necessary permission.

Don't panic, with the necessary screening tests, treatment is very effective in most cases.

Take care

Reply to BloodBanker
Posted by: Penny | 2004/10/28

This Rhesus factor which is a protein on the red blood cells, does it has anything to do with the HIV virus?
What are the similarities of this factor?
What are the posibilities of danger?
Does it have any treatment if positive?
Do a person have to go for counseling?
What are the symptoms?

Reply to Penny
Posted by: BloodBanker | 2004/10/27

From a genetic and serological perspective, Zxr is correct.

However the blood group system is now termed the Rh system and NOT Rhesus. Rhesus is the species of monkey, on which the initial typing tests were performed. So to be correct, one may be blood typed as O Rh Positive, and not O Rhesus Positive.

Take care and don't hesitate to ask more questions on blood banking technology. (perhaps on another expert forum!)


Reply to BloodBanker
Posted by: zxr | 2004/10/27

hope this helps at all...

We all inherit a set of three Rhesus (Rh) genes from each parent called a haplotype. You may have heard of the c, d, e, C, D and E genes. The upper case letters denote Rh positive genes and the lower case, negative and we inherit either a positive or negative of each gene from each parent (eg. CDe/cde, cdE/cDe etc.). This means that we then possess two of each gene and can pass either to our offspring.

If a person is tested Rh positive, their blood is said to contain the Rhesus factor - if they are tested negative it does not. A person possessing one or more positive Rh genes (C, D or E), anywhere in their inherited haplotypes, has inherited the Rh factor (eg. cdE/De, cde/cDe etc.) and they are tested Rh positive - only a person with a genotype of cde/cde is truly Rh negative.

Reply to zxr
Posted by: Anon too | 2004/10/27

Not sure, i thought Rhesus was something to do with monkeys?

Reply to Anon too

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