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Lao M, Calhoun BC, Bracero LA, Wang Y, Seybold DJ, Broce M, Hatjis CG (2009). "The ability of the quadruple test to predict adverse perinatal outcomes in a high-risk obstetric population". J Med Screen. 16 (2): 55–59. doi:10.1258/jms.2009.009017. PMID19564516. S2CID23214929.
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Spencer K, Liao AW, Ong CY, Flack NJ, Nicolaides KH (2001). "Maternal serum activin A and inhibin A in trisomy 18 pregnancies at 10-14 weeks". Prenat Diagn. 21 (7): 571–574. doi:10.1002/pd.125. PMID11494294. S2CID32154357.
Yudin MH, Prosen TL, Landers DV (October 2003). "Multiple-marker screening in human immunodeficiency virus-positive pregnant women: Screen positivity rates with the triple and quad screens". Am. J. Obstet. Gynecol. 189 (4): 973–6. doi:10.1067/S0002-9378(03)01053-6. PMID14586337.
Lao M, Calhoun BC, Bracero LA, Wang Y, Seybold DJ, Broce M, Hatjis CG (2009). "The ability of the quadruple test to predict adverse perinatal outcomes in a high-risk obstetric population". J Med Screen. 16 (2): 55–59. doi:10.1258/jms.2009.009017. PMID19564516. S2CID23214929.
Benn PA (2002). "Advances in prenatal screening for Down syndrome: I. general principles and second trimester testing". Clin. Chim. Acta. 323 (1–2): 1–16. doi:10.1016/S0009-8981(02)00186-9. PMID12135803.
Lamlertkittikul S, Chandeying V (2007). "Experience on triple markers serum screening for Down syndrome fetus in Hat Yai, Regional Hospital". J Med Assoc Thai. 90 (10): 1970–6. PMID18041410.
Wald NJ, Morris JK, Ibison J, Wu T, George LM (2006). "Screening in early pregnancy for pre-eclampsia using Down syndrome quadruple test markers". Prenat. Diagn. 26 (6): 559–64. doi:10.1002/pd.1459. PMID16700087. S2CID1751873.
Spencer K, Liao AW, Ong CY, Flack NJ, Nicolaides KH (2001). "Maternal serum activin A and inhibin A in trisomy 18 pregnancies at 10-14 weeks". Prenat Diagn. 21 (7): 571–574. doi:10.1002/pd.125. PMID11494294. S2CID32154357.
Lao M, Calhoun BC, Bracero LA, Wang Y, Seybold DJ, Broce M, Hatjis CG (2009). "The ability of the quadruple test to predict adverse perinatal outcomes in a high-risk obstetric population". J Med Screen. 16 (2): 55–59. doi:10.1258/jms.2009.009017. PMID19564516. S2CID23214929.
Wald NJ, Morris JK, Ibison J, Wu T, George LM (2006). "Screening in early pregnancy for pre-eclampsia using Down syndrome quadruple test markers". Prenat. Diagn. 26 (6): 559–64. doi:10.1002/pd.1459. PMID16700087. S2CID1751873.
Spencer K, Liao AW, Ong CY, Flack NJ, Nicolaides KH (2001). "Maternal serum activin A and inhibin A in trisomy 18 pregnancies at 10-14 weeks". Prenat Diagn. 21 (7): 571–574. doi:10.1002/pd.125. PMID11494294. S2CID32154357.