MedicalTerminology DB
General Medical Terms Blood & Lymphatic System

ABO blood group system

Meaning of ABO blood group system: A system used to group human blood into different types, based on the presence or absence of certain markers on the surface of red blood cells.

Definition of ABO blood group system

A system used to group human blood into different types, based on the presence or absence of certain markers on the surface of red blood cells. The four main blood types are A, B, O, and AB. For a blood transfusion, the ABO blood group system is used to match the blood type of the donor and the person receiving the transfusion. People with blood type O can donate blood to anyone and are called universal donors. People with blood type AB can accept blood from all donors and are called universal recipients. People with type A or B can receive matching blood or type O blood.

For learning, not diagnosis. This glossary provides general educational information and is not a substitute for advice from a qualified healthcare professional. If you may be experiencing a medical emergency, contact local emergency services.