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Prenatal Group B Strep Screening

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Also known as: Group B Beta-hemolytic Streptococcus; Group B Streptococcus; Group B Strep; GBS; Strep Group B; Beta-hemolytic Strep Culture
Formal name: Prenatal Group B Streptococcus Screening

At a Glance

Why Get Tested?

To screen a pregnant woman for the presence of group B streptococcus (GBS) to determine the risk that she will pass the bacteria on to her newborn, possibly resulting in a serious infection

When to Get Tested?

When a pregnant woman is between 35 and 37 weeks of gestation or has preterm labor or preterm premature rupture of membranes

Sample Required?

A culture swab obtained from the vagina and rectum of a pregnant woman; a urine sample collected anytime during pregnancy may be used to detect significant numbers of GBS.

Test Preparation Needed?