A na-eji okpo ibu nke ngwaọrụ a. Ihe nlereanya mara mma, ọ nwere uru pere mpe nke obere olu, obere ibu, ikike buru ibu, mkpọtụ dị ala, arụmọrụ dị elu na ya mere. Enwere ike iji ya n'ụlọ ọgwụ na ụlọ nyocha biochemical maka nyocha nke ọbara, urea na plasma.