OBJECTIVE: To consider the risk of intercourse without contraception during infertility
treatment. DESIGN: Case report. SETTING: Leiden University Medical Center. PATIENT (S):
An infertile couple underwent IVF for tubal pathology. INTERVENTION (S): Transfer of one
embryo during a natural cycle. MAIN OUTCOME MEASURE (S): Human leukocyte antigen
typing, histochemical analysis of the fetal membranes, neonatal and maternal clinical
outcomes. RESULT (S): A dizygotic twin pregnancy was confirmed after birth by human …