ACOG Committee Opinion No. 348, November 2006: Umbilical cord blood gas and acid-base analysis – About Your Online Magazine


Cord blood gas analysis and acid-base assessment are the most objective determinations of the fetal metabolic condition at birth. Scores of moderate and severe neonatal encephalopathy, respiratory complications and composite complications increase with a deficit in the umbilical artery base of 12-16 mmol / L. Moderate or severe complications in newborns occur in 10% of neonates who have this level of acidemia and the rate increases to 40% in neonates with an umbilical artery base deficit greater than 16 mmol / L at birth. Immediately after the delivery of the newborn, a segment of the umbilical cord must be clamped twice, divided and placed on the delivery table. Doctors should try to obtain venous and arterial cord blood samples in circumstances of cesarean delivery for fetal impairment, low 5-minute Apgar score, severe growth restriction, abnormal fetal heart rate tracking, maternal thyroid disease, intrapartum fever or multifetal pregnancy .

Paula Fonseca