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Culture, Beta Strep Only (Group B)

Mnemonic

C BS

Synonym

Beta Strep Group B Culture - Streptococcus (Group B) Culture

Guidelines

This is a prenatal screening test for Group B streptococcus carriage. Collect this test at 35-37 weeks’ gestation. For use with genital and rectal swabs. It is recommended to collect from both Vaginal and Rectal sites. Cervical specimens or specimens collected with a speculum are NOT recommended.

Specimen Collection Requirements

Patient Preparation

Using a single swab or two separate swabs, swab the vaginal introitus followed by the rectum, insert swab through the anal sphincter.

Collect

Culture collection and transport swab

View Swab Collection Guide

Supply Item Number - 236377

Handling

Indicate specimen sources.

Preferred Volume

1 or 2 swabs in culture transport system

Minimum Volume

1 swab in culture transport system

Transport

Room temperature

Rejection Criteria

Frozen specimen, nonsterile or leaking containers

Stability

Ambient: 72 hours; Refrigerated: 72 hours; Frozen: Unacceptable

Testing Information

Performed

7 days/week

Reported

Preliminary Negative: 2 days; Final Negative: 3 days

Method

Standard Bacterial Culture with broth enhancement

Reference Values

Reference Values

No beta Strep Group B

Comments

Susceptibilities are by special request only or if the lab is notified that the patient is allergic to penicillin.  Virtually 100% of Group B strep are still susceptible to penicillin, the drug of choice. Additional charges for identification and to differentiate normal flora from pathogens (CPT 87077) as needed. Susceptibility if needed (CPT 87186, 87184, 87181)

CPT Codes

87081, (87077, 87186, 87184, 87181 as needed)

Last Updated: Tuesday, January 12, 2021 01:31:55 AM


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