Medically reviewed by Amelia MacIntyre, DO One of the most important characteristics of blood is its type. Knowing your blood ...

The blood type of B negative is also uncommon, occurring in "2% of Caucasian, 1% of African American, 0.4% of Asian and 1% of Latino American" populations, says the Red Cross.

People with type O blood enjoy a slightly lower risk of heart disease and blood clotting, but they may be more susceptible to hemorrhaging or bleeding disorders. This may be especially true after ...

B positive. Another rare type, it is found in 8.5% of people. ... If you have type O negative or positive, the blood bank may request your whole blood or just red blood cells.

There are eight blood types: A positive, A negative, B positive, B negative, O positive, O negative, AB positive and AB negative. But which is the rarest?

There are also Rhesus (Rh) antigens, which determine if blood is "positive" or "negative." If you have Rh proteins on the surface of your red blood cells, you are Rh positive (like me and about 80 ...

Having a second pregnancy. With a second pregnancy and another positive baby, the antibodies enter the baby’s circulation through the placenta where they become attached to the foetal red blood cells ...

Type B positive and B negative donors have the more rare blood types. B positive donors make up 9 percent of the population while B negative donors are the second rarest at only 2 percent.