Table 1: Antepartum validity of the accelerated GBS test compared to GBS culture.

GBS test (n = 356)PrevalenceSensitivitySpecificityPPVNPV

In-house culture105 (29.5%)reference
Commercial culture84 (23.6%)73.3 (63.7–81.3)97.2 (94.1–98.8)91.7 (83.0–96.3)89.7 (85.3–92.9)
Accelerated GBS test131 (36.8%)97.1 (91.3–99.3)88.4 (83.7–92.0)77.9 (69.6–84.4)98.7 (95.8–99.7)

Numbers are n (%). Data are % (95th percentile confidence interval).
PPV: positive predictive value; NPV: negative predictive value.