Blood types are determined by the presence or absence of antigens (A and B) on red blood cells and corresponding antibodies in the plasma. The main ABO blood groups are A, B, AB, and O. The Rh factor (positive or negative) is another important factor. Blood type compatibility is crucial for safe blood transfusions. ABO Blood Group System: Blood group A: Has A antigens on red blood cells and anti-B antibodies in the plasma. Blood group B: Has B antigens on red blood cells and anti-A antibodies in the plasma. Blood group AB: Has both A and B antigens on red blood cells and no antibodies in the plasma. Blood group O: Has no A or B antigens on red blood cells and both anti-A and anti-B antibodies in the plasma. Rh Factor: The Rh factor is another antigen found on red blood cells. If present, the blood type is Rh-positive (+). If absent, it's Rh-negative (-). For example, someone with blood type A and the Rh factor present is A+. Someone with blood type A and no Rh factor is A-. Blood Type Compatibility: ABO system: Individuals with blood type O are considered universal donors (can donate to any blood type), while individuals with blood type AB are considered universal recipients (can receive from any blood type). Rh factor: Rh-positive blood can be donated to both Rh-positive and Rh-negative recipients, but Rh-negative blood should only be donated to other Rh-negative individuals. Compatibility chart: A detailed chart (like the one from Cleveland Clinic) helps determine which blood types can be safely transfused to each other. In Pimpri Chinchwad Pune Exploring Truth... NIDAN Pathology Laboratory ISO 9001:2015 Certified Book Free Home Collection : 7775837228/8999989854 Email Id: nidanpathology331@gmail.com Rupeenagar Chakan | Punawale Wakad | Pimpari | Krushnanagar | Ravet