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Cations (Magnesium, Potassium, Sodium), Creatinine, Bilirubin, and Osmolality of Bovine Fetal Fluids

University Institute of Forensic Medicine Anthropological Department
Department of Pharmacology, University of Copenhagen, Denmark

ABSTRACT

Magnesium, potassium, sodium, creatinine and bilirubin concentrations, and osmolality in bovine fetal fluids have been investigated to seek a possible application to the determination of gestation age. Potassium ion concentration during pregnancy decreased in amniotic fluid. Sodium ion concentration and osmolality increased in allantoic fluid during the same period. Creatinine concentration rose throughout pregnancy in both amniotic and allantoic fluids. However, none of these indicators provided a reliable correlation with fetal age as determined by measurements of head circumference.