The ABO blood group system is a classification system for the antigens of human blood discovered by Karl Landsteiner in 1900. There are four blood groups : A, B, AB and O. The Rh blood group system is the second most significant system for blood grouping. Rh factor refer to Rh D antigen only. Determination of Rh factor along with ABO is essential for defining the Rh +ve or Rh -ve status of the individual. Around 85% of the human population is Rh +ve while 15% is Rh -ve. The ABO & Rh systems are the most significant blood group systems from the clinical point of view. The routine practice of blood typing and cross-matching blood products prevent adverse transfusion reactions caused by ABO antibodies. ABO blood grouping is used to check the RBCs & plasma compatibility of donor and recipient before blood transfusion. ABO blood group have been used as a genetic marker in the studies of association with infectious & non-infectious disease. It is also significant for determination of Rh incompatibility between mother and foetus. Salient Features: Excellent Sensitivity, detect even weaker groups with ease Excellent Avidity Excellent Intensity : Clearly visible agglutination High Specificity with no cross reactivity Longer Shelf Life : 12 months Batch to Batch consistency Slide & Tube test results show excellent co-relation