Will I be tested for Group B Streptococcus (GBS)?

Your doctor will test you for GBS late in your pregnancy, around week 35 to 37, by using a cotton swab to take samples of cells from the vagina, cervix, and rectum. Testing for GBS earlier than this will not help predict if you will have GBS at the time of delivery.

Delivery is a time of increased exposure to GBS bacteria for newborns if it is present in the vagina or rectum of the mother. A positive culture result means you are a GBS carrier, but it does not mean that you or our baby will definitely become ill.

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