Carboxyhemoglobin in umbilical cord blood and maternal smoking

Background Smoking during pregnancy still exists in daily life but the effect on the newborn in the early stage of life is still unclear. This study investigates the normal reference range of carboxyhemoglobin (HbCO) in umbilical cord blood gas (UBG). Methods A single center retrospective cross-sectional cohort study was performed with 1172 cases. We analyzed HbCO values in umbilical cord blood, maternal smoking, birth weight percentiles,...