Blood transfusion is the way toward moving blood or blood items into one's course intravenously. Transfusions are utilized for different ailments to supplant lost parts of the blood. Early transfusions utilized entire blood, however current clinical practice generally utilizes just parts of the blood, for example, red platelets, white platelets, plasma, thickening components, and platelets. Red platelets (RBC) contain hemoglobin, and gracefully the cells of the body with oxygen. White platelets are not generally utilized during transfusion, yet are a piece of the resistant framework, and battle diseases. Plasma is the fluid piece of the blood, which goes about as a support, and contains proteins and significant substances required for the body's general wellbeing. Platelets are engaged with blood thickening, keeping the body from dying. Before these parts were known, specialists accepted that blood was homogenous. Along these lines, numerous patients kicked the bucket on the grounds that contrary blood was moved to them.