Blood type O- is the universal donor blood type. This means that people with type O- blood can donate blood to people with any blood type. This is because type O- blood does not have any A or B antigens on the surface of the red blood cells. Antigens are proteins that the body’s immune system can attack. If someone receives blood with antigens that their body does not recognize, their immune system will attack the blood cells, which can lead to serious health problems.
Blood type A blood can be donated to people with type A or type AB blood. Blood type B blood can be donated to people with type B or type AB blood. Blood type AB blood can be donated to people with type AB blood.
It is important to note that blood type is not the only factor that determines whether or not a person can donate blood. Other factors, such as the person’s health and medical history, must also be considered.