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Group B strep screening in pregnancy

Pregnancy

Pregnancy (late pregnancy)Once per pregnancy (late pregnancy)5 minutes

GBS screening helps determine whether antibiotics are recommended during labour to protect the newborn.

Guidance for your location

Location
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Recommended Age
Pregnancy (late pregnancy)
Frequency
Once per pregnancy (late pregnancy)
Duration
5 minutes

Overview

Group B streptococcus (GBS) is a common bacteria that can be present in the vagina/rectum without causing symptoms. Screening late in pregnancy identifies who should receive antibiotics during labour to reduce the risk of newborn infection. This test is usually performed at a specific gestational window (clinic-dependent).

Who Should Get This Screening

  • Most pregnant people, typically screened in late pregnancy (often around 35–37 weeks; timing varies).
  • Some people may receive antibiotics without screening based on prior pregnancy/newborn history (clinician-guided).

What to Expect

A swab is taken from the vagina and rectum (some clinics allow self-collection). The sample is sent to a lab to check for GBS.

How to Prepare

Follow these tips to prepare for your screening

  • No special preparation.

Benefits

  • Reduces the risk of serious newborn infection when positive and treated in labour.
  • Quick and simple test.

Things to Consider

  • Mild discomfort from swabbing.
  • False negatives can occur; clinicians may still treat based on risk factors.

Guideline Source: Prenatal care

This information is provided for educational purposes only and should not replace professional medical advice. Always consult with your healthcare provider for personalized recommendations.