References
- Merkatz I R, Nitkowsky H M, Macri J N, Johnson W E. An associatior between low maternal serum alpha‐fetoprotein and fetal chromosome abnormalities. Am J Obstet Gynecol 1984; 148: 886–894
- Haddow J E, Palomaki G E, Knight G J, Williams J, Pulkkinen A, Canick J A, Saller D N, Bowers G B. Prenatal screening for Down': syndrome with use of maternal serum markers. N Engl J Med 1992; 327: 588–593
- Brazerol W F, Grover S, Donnenfeld A E. Unexplained elevated maternal serum alphafetoprotein levels and perinatal outcome in ar urban clinic population. Am J Obstet Gynecol 1994; 171: 1030–1035
- Hsieh T T, Hung T H, Hsu J J, Shau W Y, Su C W, Hsieh F J. Predictior of adverse perinatal outcome by maternal serum screening for Dowr syndrome in an Asian population. Obstet Gynecol 1997; 89: 937–940
- Cho S, Durfee K K, Keel B A, Parks L H. Perinatal outcomes in prospective matched pair study of pregnancy and unexplained ele vated or low AFP screening. J Perinatal 1997; 25: 476–483
- Gonen R, Perez R, David M, Dar H, Merksamer R, Sharf M. The association between unexplained second trimester maternal satin hCG elevation and pregnancy complications. Obstet Gynecol 1992; 80: 83–86
- Benn P A, Home D, Brigand S, Rodis J F, Clive J M. Elevated seconc trimester maternal serum hCG alone or in combination with elevatec alpha‐fetoprotein. Obstet Gynecol 1996; 87: 271–222
- Lieppman R E, Williams M A, Cheng E Y, Resta R, Zingheim R, Hickok D E, Luthy D A. An association between elevated levels of human chorionic gonadotropin in the midtrimester and adverse pregnancy outcome. Am J Obstet Gynecol 1993; 168: 1852–1857
- Santolaya‐Forgas J, Jessup J, Burd L I, Prins G S, Burton B K. Pregnancy outcome in women with low midtrimester maternal serum unconjugated estriol. J Reprod Med 1996; 41: 87–90
- Schleifer R A, Bradley L A, Richards D S, Ponting N R. Pregnancy outcome for women with very low levels of maternal serum unconjugated estriol on second‐trimester screening. Am J Obstet Gynecol 1995; 173: 1152–1156
- Wald N J, Cuckle H S. Raised maternal serum alpha‐fetoprotein levels in subsequent pregnancies (Letter). Lancet 1981; I: 1103
- Dar H, Merksamer R, Berdichevsky D, David M. Maternal serum markers in consecutive pregnancies: a possible genetic predisposition to abnormal levels. Am J Med Genet 1996; 61: 154–157
- Spencer K. Between‐pregnancy biological variability of maternal serum alpha‐fetoprotein and free beta hCG: implications for Down syndrome screening in subsequent pregnancies. Prenat Diagn 1997; 17: 39–45
- Benn P A, Home D, Brigante S, Greenstein R M. Prenatal diagnosis of diverse chromosome abnormalities in a population of patients identified by triple‐marker testing as screen positive for Down syndrome. Am J Obstet Gynecol 1995; 173: 496–501
- Benn P A, Borgida A, Home D, Briganti S, Collins R, Rodis J F. Down syndrome and neural tube defect screening: the value of using gestational age by ultrasonography. Am J Obstet Gynecol 1997; 176: 1056–1061
- Williams R L, Creasy R K, Cunninghan G C, Hawes W E, Tashiro M. Fetal growth and perinatal viability in California. Obstet Gynecol 1982; 59: 624–632
- Holding S, Cuckle H. Maternal serum screening for Down's syndrome taking account of the result in a previous pregnancy (Letter). Prenat Diagn 1994; 321–324
- Zimmerman R, Streicher A, Huch R, Huch A. Effect of gravidity and parity on the parameters used in serum screening for trisomy 21 (Letter). Prenat Diag 1995; 15: 781–782
- Wald N J, Watt H C. Serum markers for Down's syndrome in relation to number of previous births and maternal age. Prenat Diagn 1996; 16: 699–703
- Larsen S O, Christiansen M, Norgaard‐Pedersen B. Inclusion of serum marker measurements from a previous pregnancy improves Down syndrome screening performance. Prenat Diagn 1998; 18: 706–712
- Cusick W, Rodis J F, Vintzileos A M, Albini S M, McMahon M, Campbell W A. Predicting pregnancy outcome from the degree of maternal serum alpha‐fetoprotein elevation. J Reprod Med 1996; 41: 327–332
- Phillips O P, Simpson J L, Morgan C D, Anderson R N, Shulman L P, Meyers C M, Sibai B, Shaver D C, Tolley E A, Elias S. Unexplained elevated maternal serum alpha‐fetoprotein is not predictive of adverse outcome in an indigent urban population. Am J Obstet Gynecol 1992; 166: 978–982
- Walton D, Norem C, Schoen E, Colby C. Does elevated hCG have clinical utility as a predictor of adverse pregnancy outcome [Abstract]?. Am J Obstet Gynecol 1999; 180: S68