Immuno Haematology, also known as blood group serology, is a specialized branch of laboratory medicine that focuses on the study of blood group antigens, antibodies, and compatibility testing. It plays a vital role in safe blood transfusions, management of hemolytic disorders, prenatal care, and organ transplantation. Accurate immunohematological testing is crucial to prevent transfusion reactions, hemolytic disease of the newborn, and other immune-mediated complications. The key components of immunohematology include blood grouping (ABO and Rh typing), antibody screening and identification, crossmatching, and detection of irregular antibodies. Advanced techniques also assess minor blood group antigens and perform extended phenotyping, particularly in patients requiring repeated transfusions. Testing helps ensure compatibility between donor and recipient blood, minimising risks of hemolysis and immune reactions.

Blood samples are collected under standardized protocols and tested using automated analyzers or manual serological methods. These tests involve mixing patient serum or plasma with donor red blood cells to detect antigen-antibody reactions, providing essential information for safe transfusions and immunological evaluation. Specialized tests such as direct and indirect antiglobulin tests (Coombs test), detect autoimmune hemolysis or sensitisation.

Immunohematology is closely integrated with the blood bank and transfusion services to provide comprehensive support for surgical procedures, trauma care, oncology treatments, and obstetric management. Accurate results guide transfusion decisions, monitor therapy in hemolytic diseases, and prevent immunological complications. By ensuring safe blood transfusions and detecting immune-mediated blood disorders, immunohematology contributes significantly to patient safety, effective clinical management, and improved outcomes. It is a cornerstone of modern laboratory medicine, supporting both routine and specialized medical care.