lillygator
DIS Veteran
- Joined
- Dec 27, 2003
I am A+, one DD is A+, one is O+ and don't know about DH.
BUT...after decades of giving blood, it looks like I may have to stop. It seems the Red Cross has massacred my veins. Twice I've been to the hosptal to have tests done, and when they have tried to take blood, found it very hard to get a 'good' vein. That was never the case with me.
AB- sadly.. I hope I don't ever need blood or I'm a goner! lol
If you're a guy or post menopausal, you can get any blood. The Rh factor is just an issue when you're having kids, so if a man is in an accident and needs blood, they can safely give him O+ regardless of his blood type, since a man will never be delivering a baby.
*eta* I realize I very well could be mistaken, but what I posted was what I was taught in AP Biology and have always believed. Only O- can be given to absolutely everyone, male or female.
Correct me if I am wrong.
The general belief is that negative people can only get negative blood, it just makes the most sense. But, from what I learned in the past 2 years of med school, if it is a male, or someone who is post-menopausal, you can give them positive blood. The concern comes from when a negative mother gives birth to a positive child. The first time, it's ok because there are no antibodies to the Rh factor, but with subsequent pregnancies, the antibodies that formed against the (+) Rh factor can cross the placenta leading to hemolytic disease of the newborn.
Now, if you give a (-) woman (+) blood, they'll develop antibodies to it, and then if they get pregnant, these antibodies will go and attack the fetus. Bear in mind that it takes time to develop antibodies, which is why the first time, there's usually no problems. The antibodies for A and B are naturally occuring, because they relate to certain gut flora, but the same is not true for Rh factor. So the first time you give an Rh neg. person Rh pos. blood, nothing will happen. The second time, you can get some agglutination, and if it reaches a certain point, it can be dangerous.
So if it's a life threatening situation, or a mass trauma, and there's not enough blood, you kind of play the odds. Give the men and elderly O+, since most people haven't had transfusions before, and save the O- for woman who are still child bearing age, or female children. There's no risk of a man becoming pregnant, so you don't worry about hemolytic disease of newborn. Once you have the type and cross available, you should give that type, but if you don't have it available, and you need to give blood, and your blood bank is running low (which is not uncommon in our hospital), you can give positive.
Here's a short link which sort of explains it, my textbook went into tons more detail, but I am not going to scan that in. http://www.aolhealth.com/ask-an-expert/ask-an-expert-rh-factor-and-blood-transfusion
I loved this stuff when I was in school, so I found that pretty interesting. I wonder when that came around? Or if what I was taught is still the general "rule" but you Dr. people are being taught some more detailed stuff.