Fetal maturity.
D000653:Amniotic Fluid / Q000032:analysis / Q000502:physiology; D003404:Creatinine / Q000032:analysis; D005260:Female; D005333:Fetus / Q000502:physiology; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D014465:Ultrasonics; D014508:Urea / Q000032:analysis; D014599:Uterus / Q000502:physiology
D014508:Urea; D003404:Creatinine