A method of determining suitability of a pregnant woman to be a candidate for induction of labor can include: obtaining a vaginal fluid sample from a pregnant woman; contacting the vaginal fluid sample with a PAMG-1 antibody that binds with PAMG-1; detecting whether the PAMG-1 antibody binds with PAMG-1 in the vaginal fluid sample to form a PAMG-1-antibody complex; and providing the determination of suitability for induction of labor to the pregnant woman. When the PAMG-1-antibody complex forms, the pregnant woman is determined to be in a condition that is not suitable for induction of labor because PAMG-1 is detected in the vaginal sample. When the PAMG-1-antibody complex does not form, the pregnant woman is determined to be in a condition that is suitable to be a candidate for induction of labor because the PAMG-1 is not detected in the vaginal sample.