Test Catalog

Test ID: CGBS    
Group B Streptococcus (Streptococcus agalactiae) Culture, Varies

Method Description Describes how the test is performed and provides a method-specific reference

Swabs are cultured to a sheep blood agar plate, a Columbia colistin-nalidixic acid agar plate, and a LIM broth. Cultures are incubated for 2 to 3 days, depending on microbial growth present. Streptococcus agalactiae is identified using one or a combination of the following techniques: matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry, conventional biochemical tests, latex antigen test, and nucleic acid sequencing of the 16S ribosomal RNA (rRNA) gene. Streptococcus agalactiae or no growth of S agalactiae is reported.(Church DL: Group B Streptococcus Cultures. In Clinical Microbiology Procedures Handbook. Edited by AL Leber. Washington DC, ASM Press, 2016, section 3.9.2)

PDF Report Indicates whether the report includes an additional document with charts, images or other enriched information


Day(s) Performed Outlines the days the test is performed. This field reflects the day that the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time before the test is performed. Some tests are listed as continuously performed, which means that assays are performed multiple times during the day.

Monday through Sunday

Report Available The interval of time (receipt of sample at Mayo Clinic Laboratories to results available) taking into account standard setup days and weekends. The first day is the time that it typically takes for a result to be available. The last day is the time it might take, accounting for any necessary repeated testing.

3 to 5 days

Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded

3 days

Performing Laboratory Location Indicates the location of the laboratory that performs the test