If your blood has A antigens, you have an A blood type. Blood is typed according to an ABO blood group system. ![]() Blood types are based on the antigens (or lack of them) found on your blood cells and whether or not your blood contains the Rh D factor. The vast majority of people have one of eight blood types. How many different blood types are there? From typing to transfusing, here’s what you need to know about your blood and your health. Healthy blood is essential for a healthy life. Mixing one type of blood that’s incompatible with another-thanks to things like antigens and Rh factor-can be fatal. If your blood lacks it, you have a negative blood type.Ĭategorizing blood according to type is important for things like blood transfusions, which replace blood that’s lost through surgery, accidents, and bleeding disorders. If your blood contains the Rh D factor-the most prevalent and important of the Rh factors-you have a positive blood type. Blood is further classified by its rhesus factor (aka, Rh factor). These are proteins and other molecules present on the outside of your red blood cells they determine what type of blood you have. Your plasma contains antibodies, which are substances your immune system uses to fight foreign invaders like germs and bacteria. And there’s plasma, which provides the body with things like nutrients and hormones. There are platelets, which help your blood clot. There are red and white blood cells, which carry oxygen and help fight infection, respectively. If all you know about your blood is that it’s red, you have some catching up to do.īlood is made up of a lot of different components. If she's pregnant with an RhD positive baby, the antibodies can lead to rhesus disease when they cross the placenta and start attacking the baby's red blood cells.Blood types | Blood type rarity chart | How to find out blood type | How blood type is determined | Blood type compatibility | Healthiest blood types | Blood type diet | Blood type personality If sensitisation occurs, the next time the woman is exposed to RhD positive blood her body will produce antibodies immediately. How sensitisation leads to rhesus disease Sensitisation can also occur after a previous miscarriage or ectopic pregnancy, or if a RhD negative woman has received a transfusion of RhD positive blood by mistake (although this is extremely rare).
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