Spectrophotometric analysis of amniotic fluid during early pregnancy.
D000653:Amniotic Fluid / Q000032:analysis*; D004899:Erythroblastosis, Fetal / Q000175:diagnosis*; D005260:Female; D005865:Gestational Age; D006801:Humans; D008722:Methods; D011247:Pregnancy; D013053:Spectrophotometry