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Gestational Age Estimation from Maternal Serum and Amniotic Fluid Electrolytes

THE WIDESPREAD tendency to discount importance of the gestational age estimate arises, in part, from the difficulty of obtaining precise menstrual data. Wide variation in newborn weights at any given gestational age is another factor influencing this tendency. It has been suggested that real biologic variability in intrauterine growth rates may determine such a wide birth weight range. ' The proper timing of delivery in pregnancies with high risk to the fetus is still a matter of controversy in modern obstetric management. The dilemma is to choose between prematurity and the hazards of continued intrauterine existence. Diabetes, toxemia, Rh incompatibility, suspected intrauterine growth