Physiological development of a mixed metabolic and respiratory umbilical cord blood acidemia with advancing gestational age.
Objective: To investigate respiratory and metabolic components of gestational age-dependent umbilical cord blood gas changes. Study design: Cord blood gases were determined in 1336 vigorous singletons with uncomplicated cephatic vaginal delivery at 37-43 weeks. Linear regression analysis and non-parametric statistics were used with a P < 0.05 being significant. Results: Gestational age correlated