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Test Code Prenat GBS Culture, Group B Streptococcus (Prenatal Strep)

Important Note

Reflex testing ordered as appropiate

Performing Laboratory

Memorial Hospital -Microbiology Laboratory       304-388-9353
Greenbrier Valley Laboratory     304-647-6060

Specimen Requirements

Label container with patient’s name (first and last), date and actual time of collection, and type of specimen. Maintain sterility and forward promptly at ambient temperature only. Specimen source is required on request form for processing.

  1. Obtain culture of female’s vaginal introitus and anorectum using 1 or 2 bacterial swabs. 
  2. Return swab(s) to sterile culture transport tube, and crush ampule to ensure specimen preservation.

Specimen Rejection

  • Improperly labeled, collected, stored, and transported
  • Quantity not sufficient
  • Cervical swabs 

Storage and Stability

Specimens in transport media will maintain Group B Strep viability for up to 4 days

Reference Values

Negative 

Methodology

Culture

Days Test Set Up and Turnaround

Monday through Sunday

CPT Coding

87070

87653

Additional Information

Screening of pregnant females for carriage of group B strep by culture at 35 to 37 weeks gestation will help determine which females should receive antibiotics during delivery to help prevent infection of the newborn. For maximum recovery of group B streptococci, this test should be collected and ordered separately from other cultures.