A positive RH blood group identification is a positive RH blood group, which is an RH-positive blood type. The RH blood group is a separate blood group system from the ABO blood group system, which is widely used in clinical practice.The RH blood group is named according to the presence or absence of the D antigen on the red blood cell membranes, and those containing the D antigen are Rh-positive, while those not containing the D antigen are Rh-negative. In China, more than 99% of the population has RH-positive blood type, and RH-negative blood type is rare in China. Clinical attention needs to be paid to people with RH-negative blood type, who can only receive RH-negative blood. Delivery of other types of blood is prone to hemolytic reactions, such as Rh-positive blood is imported, a serious hemolytic reaction will occur. Meanwhile Rh-negative women, when giving birth to a second child, have a greater chance of developing neonatal hemolysis. The purpose of RH blood typing is to differentiate between RH-positive and RH-negative blood types so that hemolytic reactions can be avoided when blood is required.