Blood Group ABO and Rh Typing is a fundamental yet vital test that identifies a person’s blood type, playing a critical role in ensuring safe medical practices, especially in blood transfusions, organ transplants, pregnancy care, and emergency medical situations. The ABO system classifies blood into four main types — A, B, AB, and O — based on the presence or absence of specific antigens on the surface of red blood cells. Alongside this, the Rh system further categorizes blood as either Rh-positive or Rh-negative, depending on the presence of the Rh factor (D antigen). Beyond clinical applications, blood group typing is also important for donor-recipient matching, forensic investigations, and even understanding genetic inheritance patterns. For anyone undergoing surgery, expecting a child, or planning to donate blood, ABO and Rh typing offers peace of mind and a foundation of safety. It is a small test with immense value, helping protect lives by ensuring that every drop of blood is a perfect match.