Mild Neonatal Acidemia is Associated with Neonatal Morbidity at Term.

OBJECTIVE: The aim of this study is to determine the association between mild acidemia (umbilical artery [UA] pH: 7.11-7.19) and neonatal morbidity in neonates at term. STUDY DESIGN: This is a secondary analysis of a prospective cohort of women admitted for labor at >/=37 weeks of gestation within a single institution from 2010 to 2015. Universal umbilical cord blood gas assessment was performed and validated. A composite neonatal morbidity index was created including respiratory distress, mechanical ventilation, meconium aspiration syndrome, suspected or confirmed sepsis, hypoxic-ischemic encephalopathy, need for therapeutic hypothermia, seizures and death. The cohort was stratified by UA pH into normal (>/=7.20), mild acidemia (7.11-7.19), acidemia (7.00-7.10), and severe acidemia ( /=7.20).. . Among neonates with mild acidemia, those with lower UA pH (7.11-7.14) had a greater risk of morbidity compared with those with higher UA pH (7.15-7.19), suggesting a progression of risk of morbidity as UA pH decreases.. . The majority of prior research has focused on severe acidemia (UA pH