Group B Strep Culture Screen

Test Mnemonic


CPT Codes

  • 87081 - QTY (1)



Performing Laboratory

Cleveland Clinic Laboratories


Environmental Condition Description
Ambient24 hours
Refrigerated24 hrs

Days Performed

Sun - Sat

Turnaround Time

7 days


Name Description
Culture, Identification 

Reference Range

Culture Result
Sex Age From Age To Type Range Range Unit
       No Beta Streptococcus Group B Isolated 

Special Info

Specimens must be collected by swabbing the distal vagina, followed by the rectum (insert swab through the anal sphincter using the same swab). After receipt in the lab, a preincubation step in selective broth is performed to optimize sensitivity. Group B Streptococcus (GBS) detection for vaginal-rectal specimens is also available by PCR (GBSPCR).

Clinical Info

Many women harbor Group B streptococci (Streptococcus agalactiae) that can cause infections during pregnancy or in neonates after birth. This test is intended for screening of pregnant women for vaginal and rectal Group B streptococcal colonization between 35 and 37 weeks gestation. If the patient is ß-lactam allergic, susceptibility testing should also be ordered. For the diagnosis of GBS disease, routine culture of the symptomatic body site (e.g., blood, CSF, amniotic fluid, joint fluid) should be ordered rather than a screening test.