Fetal swallowing and voiding were measured using colloidal gold and an ultrasonic scanner, respectively. Subjects in the study were in their 38-40th week of pregnancy. Cases were divided into 3 groups: normal, hydramnios, and oligohydramnios. The normal group had a mean swallowing rate of 198 ml/day and a mean voiding rate of 23.6 ml/hr. No significant differences were found among these rates and the corresponding rates in the other 2 groups. It is concluded that mechanisms other than fetal swallowing and voiding can contribute to the control of amniotic fluid volume at term.
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