Beta Hemolytic Strep Group B Culture
| Abbrev Code: | GBSCX | ||
| Order Code: | LAB3316 | Order Name: | Beta Hemolytic Strep Group B Culture |
| Methodology: | 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 |
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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) |
Interpretive
| Reference Range: | Negative for Group B Strep by culture |
| Use: |
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.
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