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

There are 35 blood groups in the world, but the two most common groups are ABO group and Rh group. These groups contain the eight blood types that dominate over 90% of the world's population.

ABO blood grouping is based on differences in the type of glycoprotein (protein with carbohydrates attached) present on the surface of red blood cells. Type A individuals have type A glycoproteins; ...

THICK blood smears (5–10 µl./cm. 2) can be grouped in the ABO blood group system by an absorptionelution technique which has been evolved in this Laboratory over the past two years.

The letters A, B and O represent various forms of the ABO gene ... If your blood has proteins, you're Rhesus, or Rh, positive. People with type O-negative blood are considered "universal ...