Diagnostic Test Directory

Microbiology Laboratory

Group B Streptococcus Screen (r/o Group B Strep.)

  • Synonyms: Streptococcus agalactiae
  • LIS Mnemonic: GBSS

    Collect

    Vaginal-rectal swab collected at 35 to 37 weeks gestation

    Volume Required

    1 double swab culture set

    Minimum Required

    1 double swab culture set

    Transport

    Send to the lab immediately at room temperature

    Stability

    Specimens stable up to 2 hours after collection

    Unacceptable conditions

    Specimens should not be refrigerated.

Days Performed

Daily

Reported

Earliest positive = 6 hours; Earliest negative = 48 hours

CPT

87071

Methodology

Screen: biochemical; Culture backup for negative specimens