Laboratory Test Detail

Last Updated: May 22, 2024 @ 9:13 am


Group B Streptococcus by PCR

  • Genital Swab in Culturette-Aerobic

Also Acceptable:
  • Cervical/Vaginal Smear in Culturette-Aerobic
  • Endocervical Swab in Culturette-Aerobic
  • Other in Culturette-Aerobic
  • Rectal Swab in Culturette-Aerobic
  • Urogenital Swab in Culturette-Aerobic
  • Vaginal Secretions in Culturette-Aerobic
  • Genital Swab in Culturette-Aerobic. Submit Refrigerated.

Also Acceptable:
  • Vaginal Secretions in Culturette-Aerobic. Submit Refrigerated.
  • Endocervical Swab in Culturette-Aerobic. Submit Refrigerated.
  • Cervical/Vaginal Smear in Culturette-Aerobic. Submit Refrigerated.
  • Urogenital Swab in Culturette-Aerobic. Submit Refrigerated.
  • Rectal Swab in Culturette-Aerobic. Submit Refrigerated.
  • Other in Culturette-Aerobic. Submit Refrigerated.
Special Handling:
  • Possible Sources: Urogenital, Vaginal or Rectal
    Specimen stable incubated in Todd Hewitt for 18-24 hrs.
    Swab can also be submitted in Todd Hewitt (LIM) Broth.
Rejection Criteria:
  • Specimen submitted frozen
  • Wood Swabs
  • Cotton Swabs
    Sample exposed to excessive heat
    Collection devices other than the dual rayon swab is not recommended.
Stability:Ambient: 1 Day(s); Refrigerated: 2 Day(s); Frozen: Unacceptable; Incubated: Unacceptable
  • Automated Real-Time PCR by Cepheid GeneXpert
Reported:2-4 Day(s)
CPT Codes:
  • 87653
Interpretive Data:

This test is performed by Cepheid GeneXpert.

The use of collection devices other than the dual rayon swab is not recommended. Other specimen types have not been validated with the Xpert GBS test.

False negative results may occur if the number of organisms in the sample is below the limit of detection.

Test results may be affected by prior antibiotic therapy.

DNA from non-viable organisms may be detected. A positive result is presumptive for the presence of GBS.
  • 3164 - GROUP B STREP-PCR
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