Group B Strep Infection | Diagnosis & Tests

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How will I know I have group B strep?

If you’re pregnant, your doctor can do a test to see if you are “group B strep positive”. This test usually is done when you are 35 to 37 weeks pregnant. To perform the test, your doctor will swab your vagina and your rectum and will send the swabs to a lab to see if the strep bacteria grow. If you have group B strep, it’s important to understand that you aren’t sick and that you probably will not make your baby sick. Knowing that you carry the bacteria just helps you and your doctor make decisions that can protect your baby from infection.

Written by familydoctor.org editorial staff

Reviewed/Updated: 05/14
Created: 09/00

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