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Test Code GBSR Group B Strep Detection by PCR w reflex to Culture (Prenatal)

Important Note

Reflex to culture is recommended only for patients who are known to be penicillin-allergic.

If not penicillin-allergic please order test GBS.

Performing Laboratory

Hunterdon Medical Center Labroatory

Useful For

Prenatal screening (35-37 weeks gestation): Group B Strep carriers can be identified and given antimicrobial prophylaxis during delivery to redule the risk to the neonate. This test is recommended only for patients who are known to be penicillin-allergic.

If PCR result is POSITIVE, culture and susceptibility testing will be reflexed automatically. Group B Streptococci are susceptible to penicillin, ampicillin and cefazolin. When susceptibility testing is performed clindamycin and vancomycin will be reported.

Test Algorithm

Culture method with susceptibility testing will be reflexed automatically if NAA results are positive.

Specimen Required

Dual-tipped routine culture collection swab.

Specimen Type

Vaginal/Rectal Swab

Specimen Transport Temperature

Ambient temperature (15-25°C).

Deliver within 24 hours.

Specimen Stability Information

 

Temperature Time Frame
Ambient 15-25°C 24 hours
Refrigerated 2-8°C 72 hours

Day(s) Test Setup

Monday through Sunday

Reference Values

Negative

Methodology

Nucleic Acid Amplification (NAA, PCR). Enrichment media utilized to optimize the recovery of Group B Strep

CPT Code Information

87150

LOINC Code Information

48683-7