For Laboratorians

2019 Guidelines update

On June 25, 2019, the American College of Obstetricians and Gynecologists released updated guidance for prevention of early-onset group B Streptococcus (GBS) disease in newborns. On July 8, 2019, the American Academy of Pediatrics released a new clinical report for management of infants at risk for GBS disease. All GBS prevention guidance found on CDC’s website pertains to the 2010 guidelines only. The American Society of Microbiology is currently reviewing GBS laboratory guidance. In the meantime, microbiologists should continue to follow the guidance included in the 2010 GBS guidelines.

Key Differences for Laboratorians in 2010 Guidelines compared to 2002 Guidelines

  • Expanded options for laboratory detection of GBS, including use of pigmented media and polymerase chain reaction (PCR) assays
  • There is a revised colony count threshold for laboratories to report GBS in the urine of pregnant women.