Does blood type mismatch require a paternity test? In paternity testing, blood type mismatch often causes people\’s confusion because the genetic rules of blood type are relatively complex. Therefore, this article will elaborate on the need for a paternity test, its necessity and methods, in order to provide readers with better guidance. 1. Does blood type mismatch require a paternity test? Blood type mismatch is a very common phenomenon in parent-child relationships, but it does not mean that a paternity test is necessary. If the blood types of both parents are known, and the child\’s blood type matches the blood types of the two biological parents, then