UNMEASURABLE RELAXIN CONCENTRATIONS IN REPEATED PREGNANCIES AFTER EMBRYO-TRANSFER

Unmeasurable serum relaxin concentrations were found in repeated serum samples taken during two subsequent pregnancies in a woman pregnant a fter in vitro fertilization in artificial cycles. Despite the absence of relaxin both pregnancies were carried out normally until term excep t for symptoms of pelvic girdle relaxation. Labour induction was attem pted at term as placental insufficiency was suspected. However, the ce rvical score remained unfavourable and Cesarian section was performed. In the second pregnancy elective Cesarian section was performed due t o mild preeclampsia. This case indicates that relaxin may not be impor tant for either suppression of myometrial activity or pelvic girdle re laxation during human pregnancy.