Test for group B strep

Expect to be tested for group B streptococcus (GBS) during the third trimester. GBS is a common germ found in the intestines and lower genital tract. It's most often harmless in adults. But babies who become infected with GBS during vaginal delivery can get very sick.

To check for GBS, a member of your healthcare team swabs your lower vagina and anal area. Some people take their own GBS swab after their healthcare team tells them how to do it.

The sample goes to a lab for testing. If the sample is positive for GBS, or if you've already had a baby who got GBS disease, you'll get antibiotics through a vein during labor. The antibiotics help protect your baby.