is there a positive and negative o blood
The O positive blood type is not a rare blood type. It is the most common blood type, according to the American Red Cross. The rarest blood type is AB negative.
The O negative blood type is particularly helpful in emergency situations. With O negative blood transfusion, trauma and accident victims are given a chance at life. This blood type is called universal because it can be transfused to almost any patient in need of whatever blood group. Truly important in emergency situations whenever an individual requires immediate blood transfusion.