The most common blood type is O positive. There are four blood group types: A, B, AB and O. These groups are determined by the presence or absence of two antigens, A and B, on the red blood cell surface. More »

The four major blood types present in the human population include group A, group B, group AB and group O, according to the Red Cross. These blood type groups are based on blood antigens and antibodies. More » Health Medical Ranges & Levels

The four different groups of blood are classified as group A, group B, group AB and group O, according to the American Red Cross. Each group contains two blood types, a plus type and a minus type. For example, blood grou... More » Health Diagnostics & Imaging

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. More »

Puncture your finger safely with a lancet to collect blood, and use a blood type testing kit with an EldonCard to determine your type. You need a medicine dropper, water, rubbing alcohol, a tissue to apply the alcohol, a... More »

Blood type is an inherited trait that depends on the blood type combination of a child's biological parents, states Baylor Scott & White Health. The A and B blood types are dominant genes and the O blood type is recessiv... More »

The blood type that is known as the universal acceptor is type AB. In total, there are eight different types of blood that a person can have. More »