A woman’s type O blood can generally be used as a universal transfuser, which is a benefit of type O blood. However, only small amounts should be transfused in emergencies and not too much of the opposite blood type. Blood type O is one of the common blood types, and is a blood type that contains neither A nor B antigens. Generally speaking, type O is an all-suitable blood donor, and people with type O blood are also called universal transfusionists in folklore, and their blood can be donated to anyone, which can also be said to be the benefit of type O blood. However, clinically, only in special emergencies, a small amount of O-type blood will be imported for the first aid of people with blood loss of other blood types, and the same type of blood will still be used after passing the danger period to prevent serious hemolytic reactions caused by the importation of heterogeneous blood types.