It is important to know which blood type you have.
There are 4 main blood types: A, B, AB, O.
A blood bank specialist will determine your blood type based on whether the A or B antigen is present on your red blood cells. They will also be interested in your Rh factor. If you have this protein, you are a carrier of a positive blood type, and if the Rh factor is not found, you are negative.
The rarest blood type in the world is the zero Rh factor. This blood type is found in up to 50 people and is so rare and universal that scientists call this type “golden blood”.
You inherit your blood type from your biological parents.
Blood type O negative is a universal donor. This type of group is used in emergencies because it does not contain antigen markers. A universal recipient is anyone with an AB positive blood type.
Normally, you carry the same blood type throughout your life, although in rare cases, your type can change due to certain circumstances, such as a bone marrow transplant or leukemia, as well as some infections. Not all of these changes in your blood are permanent.
https://my.clevelandclinic.org/health/treatments/21213-blood-types
