![]() Interested in finding out what blood type you are?ĭon’t know your blood type? We’ll test your blood when you donate and let you know your type. If your blood and your babys blood mix, your body will start to make. While having O negative blood makes you a universal blood donor, it also means that if you need blood, you can only be transfused with O negative blood. If your blood is A positive (A+), it means that your blood contains type-A antigens with the presence of a protein called the rhesus (Rh) factor. But during pregnancy, being Rh-negative can be a problem if your baby is Rh-positive. Not only will you help save lives, but you’ll also ensure there’s a good supply of O negative available should you need blood. If you have O negative blood and are able to donate, we encourage you to do so. What does this mean for those with O negative blood? O negative blood may not be the rarest blood type, but may be critical to a victim’s survival in an emergency. When trauma victims need urgent treatment, there is seldom time to test their blood type, so O negative blood is used. In addition, emergency services, including ambulances and helicopters, may also carry it to keep patients alive while they’re being transported to a hospital. Hospitals need to have it on hand for emergencies. During pregnancy, problems can occur if you. ![]() O negative blood is valuable because it can be transfused to anyone, regardless of their blood type. The positive or negative part of your blood type, such as O positive or A negative, refers to your Rh status. If O negative isn’t that rare, why do blood centers and hospitals always need it? Fewer than 50 people in the entire world population are known to have Rh-null blood. However, the rarest blood type in the world is Rh-null, which is so rare most of us have never heard of it. ![]() Those four main blood groupsA, AB, B, and Ocan be Rh-positive or Rh-negative, meaning that there are 8 blood groups in total. Is that rare? Only about 1 in 67 have B negative blood, making it rarer. Negative blood types are also somewhat protected from the virus. Or to put it another way, about 1 in 15 people have O negative blood. If you are Type O, both A’s and B’s are dangerous, so you should not receive a transfusion of any type other than O. If you have 0 negative blood, you have something in common with about 7 percent of the US population. Putting blood with A antigens into your body, if your own blood does not have A antigens (Type A or AB), will cause an immune response that can kill you. In addition, a person who is Rh-positive can receive blood from someone who is Rh-negative, but those with a negative blood type cannot receive blood from those with a positive blood type.People with O negative blood often wonder how rare their blood is since it is always in demand by hospitals and blood centers. Rh incompatibility can occur when a pregnant woman has Rh-negative blood, and her baby has Rh-positive blood. For example, if a person with type A blood received a type B or AB blood transfusion, an ABO incompatibility response would occur. When blood cells are transfused that aren’t compatible with the recipient’s blood type, the immune system recognizes them as foreign invaders and responds by attacking and destroying them (incompatibility). Their bodies recognize A, B, and Rh antigens as their own, allowing them to receive red blood cells of any ABO or Rh type Universal recipients have type AB, Rh-positive blood (AB+). The red blood cells do not contain antigens or the Rh factor to interact with a recipient's antibodies. Yes, universal blood donors have type O, Rh-negative blood (O-), which is compatible with all blood types.
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