𝐘𝐨𝐮𝐠𝐚𝐧𝐤 𝐯𝐞𝐫𝐦𝐚* on Instagram: "There are eight common blood types (A+, A-, B+, B-, AB+, AB-, O+, O-) determined by A, B antigens and the Rh factor (+/-) on red blood cells. These define compatibility for transfusions, with O- being the universal donor and AB+ the universal recipient, and other systems exist beyond ABO and Rh. The ABO & Rh Systems- ABO System: Based on A and B antigens. Type A: Has A antigens, anti-B antibodies. Type B: Has B antigens, anti-A antibodies. Type AB: Has b