Beta Hemolytic Strep Group B Culture

Abbrev Code:GBSCX   
Order Code:LAB3316Order Name:Beta Hemolytic Strep Group B Culture
CPT Codes: 87081 x1, 87081 x1, 87186 x1, 87186 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   (Grand Itasca, Range, UMMC East Bank)


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 36 and 37 6/7 weeks gestation. PCR-based assay is optimal for Group B streptococci.


Screening Based Strategy*


Perform vaginal/rectal screen at 36-37 6/7 weeks.

ƃ          If positive, administer intrapartum antibiotics.

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

ƃ          If results unknown (delivery Ź37 w), refer to risk-based strategy.

ƃ          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:
[email protected] for TestID: 2749"