Referrals during labor in midwifery care.

In 2008, 84% (459) of 548 women with pregnancies initially considered "low risk" requested to give birth under midwifery care at Japanese Red Cross Katsushika Maternity Hospital. Of these, 42% (191) were referred to obstetric care during labor at term; however, we found no evidence that midwifery primary obstetric care is less safe for women with "low-risk" pregnancy than is standard obstetric care. Therefore, we recommend that midwifery care be promoted with an international collaborative effort.