The effect of screening-to-labor interval on the sensitivity of late-pregnancy culture in the prediction of group B streptococcus colonization at labor: A prospective multicenter cohort study.

The late-pregnancy enriched culture and intrapartum RT-PCR have comparable sensitivities in the detection of GBS when culture screening is conducted no more than 4 weeks before labor. Late-pregnancy culture sampling should be postponed to at least 37 weeks of gestation.