"Blood cells can be given to anyone," explains LeeAnn Weitekamp, the Medical Director for MI Blood. She explains that in an emergency when someone's life depends on getting blood immediately, it's the only type that will save their life because O negative is compatible with every blood type.

"It's the one type that can be given to them in that short time frame where they need it and they need it now until they actually do get typed appropriately," says Weitekamp.

What else makes O negative donors super heroes? The fact that they make up only about 9% of the world's population making it the fourth rarest blood type. And why type O negative donors are asked to give more often.

But most O negative donors like Carolyn DeWitte are more than willing. "I realize I'm a universal donor and I >>>>>>>>>read more http://planehealth..com/2013/05/why-o-negative-blood-is-so-special.html

This blood type can be a blessing and a curse. it has resulted in childlessness for a lot of women.