The concentration of amniotic fluid glucose, total protein, sodium, potassium, calcium, magnesium and phosphate as well as amniotic fluid osmolality were measured in normal second trimester pregnancies and in second trimester pregnancies complecated by fetal anencephaly or spina bifida. Amniotic
Bartter syndrome, which presents clinically with polyuria, urinary potassium loss, hypokalemia, hypercalciuria, and alkalosis, is an autosomal recessive disorder with mutations in genes encoding the Na-K-2Cl cotransporter, the chloride channel CLC-NKB, and the potassium channel ROMK. Prenatal