Human Chorionic Gonadotropin (hCG)hCG (Human Chorionic Gonadotropin) Test, Pregnancy Test ReferencesCitations American College of Obstetricians and Gynecologists
(2007). Screening for fetal chromosomal abnormalities. ACOG Practice Bulletin
No. 77. Obstetrics and Gynecology, 109(1): 217–227.
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