Maternal age-specific rates of Down syndrome used in serum screening are biased low.
Hook
E B
EB
D015982:Bias; D004314:Down Syndrome / Q000097:blood / Q000175:diagnosis* / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D011296:Prenatal Diagnosis