Ka taea hoki te kii he pūreretā iratuki, he pūreretā ataata, he pūreretā whakaahua, he kaiwhakamahara whakaahua rānei.E tohu ana ki tetahi hua i whakamahia hei tango tohu ataata me te whakaputa i nga whakaahua tohu ataata.He kaituhi ultrasound motuhake tenei , ko te nuinga he pango me te ma, engari he tae ano hoki.