Amniotic fluid rubidium concentration association with newborn birthweight: A maternal-neonatal pilot study.

Amniotic fluid rubidium concentration appears to be a strong predictor of appropriate for gestational age birthweight and a potential marker for newborn birthweight classifications. In particular, low Rb concentrations in amniotic fluid during mid-pregnancy are linked to third trimester lower birthweight percentile. These findings could potentially serve as a valuable tool for early identifying pregnancy outcomes. Further investigation is necessary to fully explore the effect of Rb on fetal development.