Third Trimester: Prenatal Labs

Group B Strep Test: This test is done at approximately 35-37 weeks and screens for group B streptococcus, a bacteria present in about 25 percent of women. The bacteria is harmless to the mother, but is very aggressive in newborns and can lead to serious infection or death if passed to your baby during delivery. If you test positive for group B strep you will be given antibiotics during labor.