Assertion: amniotic fluid's urine | /r/AtLocation | fetal bladder
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text: Urine has been observed in the fetal bladder as early as 11 weeks transabdominally2 and 9 weeks transvaginally.3 Because fetal urine is hypotonic (80–140 mOsm/ liter), it results in progressively hypotonic fluid (250–260 mOsm/liter near term) that contains increasing concentrations of urea, uric acid, and creatinine as the fetal kidneys mature.