"The advantage of this [AmniSure] test; [is that] it is much more objective, and also there is an enormous distinction between the concentration of this protein in the amniotic fluid, and the cervical vaginal discharge. The difference is about 1,000 to 10,000 fold, so that even a small leakage of amniotic fluid into the vagina will cause a large amount of this protein to be present."

Journal of Obstetrics and Gynecology, March 2007, Lee et al