Group B Streptococcal Enhancement Culture, Vaginal/Rectal

Abbrev Code:BETAB   
Order Code:LAB3316Order Name:Beta Strep Group B R/O Culture
CPT Codes: 87081 x1, 87077 x1
Turnaround Time:Results are reported within 3 days.
Associated Links:

IDDL (Microbiology/Virology) Collection Container Guidelines

Collection Instructions

Specimen:Swab/Dual Swab, specify source
Container:Culturette in liquid Stuart medium, CoPan ESwab with larger swab
Alternate Containers: CoPan ESwab with smaller swab, See Collection Instructions
Collection Instructions:UMMC, FRH, FSH, FNH, FLH: Use CoPan Eswab FRMC: Use culturette swab in liquid Stuart medium Vaginal introitus and anorectal specimens. Cervical cultures are not acceptable; a speculum should not be used for culture collection. Note: Because of its increased sensitivity, the Group B Streptococcus PCR assay is the preferred method. See separate Lab Guide entry: Group B, Streptococcus, PCR.

Processing and Shipping

Specimen Processing:Do not store.
Shipping Instructions:Ship at room temperature.
Test Performed at or Referral Lab Infectious Diseases Diagnostic Laboratory  (Range, UMMC-East Bank, Grand Itasca)


Reference Range:Negative for Group B Strep by culture

Detect group B streptococci in the genital tracts of expectant mothers. Identify infants at risk for infection and guide intrapartum administration of antibiotics. One approach has been adopted to reduce this disease: Guidelines advocate all pregnant women have a vaginal/rectal screening test for GBS between 35 and 37 weeks gestation. PCR-based assay is optimal for Group B streptococci.


Screening Based Strategy*


Perform vaginal/rectal screen at 35-37 weeks.

·          If positive, administer intrapartum antibiotics.

·          If results unknown (delivery <37 w), administer intrapartum antibiotics.

·          If results unknown (delivery ³37 w), refer to risk-based strategy.

·          If negative, do not administer intrapartum antibiotics.


*Consensus Guidelines for the Prevention of Perinatal Group B Streptococcal Disease (from the Centers for Disease Control and Prevention), Atlanta, GA.


Click HERE to Report test errors or omissions.
*If no email program is associated with this computer, please contact: for TestID: 2749"