Maternal serum free beta hCG screening.
Zimmerman
R
R
D006063:Chorionic Gonadotropin / Q000097:blood*; D018997:Chorionic Gonadotropin, beta Subunit, Human; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008403:Mass Screening; D010446:Peptide Fragments / Q000097:blood*; D011247:Pregnancy; D011296:Prenatal Diagnosis
D006063:Chorionic Gonadotropin; D018997:Chorionic Gonadotropin, beta Subunit, Human; D010446:Peptide Fragments