Free amino-acid concentrations in fetal fluids.
The pattern of free amino-acid concentrations in maternal venous plasma, fetal umbilical arterial plasma, fetal urine, and amniotic fluid at 15 to 20 weeks' gestation has been determined. Free amino-acid concentrations were greater in fetal plasma than in maternal plasma, amniotic fluid, or fetal urine.The ratios of amino-acid concentrations in fetal umbilical arterial plasma and urine indicate that the fetal kidney can effectively conserve amino-acids, possibly reaching an adult level of competence in this respect.There was little correlation between amino-acid concentrations in the fluids analysed with the exception of that between amniotic fluid and fetal urine.
D000596:Amino Acids / Q000032:analysis* / Q000097:blood / Q000378:metabolism; D000653:Amniotic Fluid / Q000032:analysis; D001826:Body Fluids / Q000032:analysis*; D005260:Female; D005333:Fetus; D005865:Gestational Age; D006801:Humans; D007668:Kidney / Q000378:metabolism; D007671:Kidney Concentrating Ability; D011247:Pregnancy; D014469:Umbilical Arteries
D000596:Amino Acids