Pregnancy outcome in women with factor V Leiden and recurrent miscarriage

We compared the outcome of 25 untreated pregnancies among women with recurrent miscarriage (RM) at <12 weeks' gestation who were heterozygous for factor V Leiden with women with unexplained RM. The livebirth rate was lower among pregnancies in carriers of factor V Leiden (12/25; 48%) compared with pregnancies in women with unexplained RM (175/307; 57%), but the difference did not reach statistical significance. The best possible treatment regimen to improve livebirth rate in this group of women needs to be assessed in the form of a randomised controlled trial.