title: False positive serum biochemical screening and subsequent fetal loss in women less than 35 years of age.
abstract: OBJECTIVE
  To examine the fetal loss rate in women younger than 35 years of age following a false positive serum biochemical screening.
  
  
  METHODS
  Retrospective analysis of case records between 1991 and 1998.
  
  
  METHODS
  Fetal medicine unit of a large teaching hospital.
  
  
  METHODS
  Four hundred and fifty-six women with singleton pregnancies and false positive serum biochemical screening for Down's Syndrome (study group). Nine hundred and twelve matched controls with true negative serum biochemical screening (control group).
  
  
  METHODS
  Women of both groups had a second trimester serum screening for Down's Syndrome using alpha fetoprotein, human chorionic gonadotrophin (hCG) and unconjugated oestriol (uE3); and they also underwent genetic amniocentesis.
  
  
  RESULTS
  The overall fetal loss rate in the study group was 5.3% (24/456), compared with 1.65% (15/912) in the control group RR 3.2, 95% CI 1.7-5.99; P < 0.001). The majority of fetal losses in the study group occurred after 28 weeks, while in the controls this happened between 24 and 28 weeks of gestation.
  
  
  CONCLUSIONS
  A false positive serum biochemical screening in women under 35 years of age is associated with a threefold increased risk of subsequent fetal loss. However, most of fetal losses in this group occurred after 28 weeks, indicating that intensive antepartum fetal surveillance could improve the perinatal outcome.
authors: First Department of Obstetrics and Gynaecology, Fetal Medicine Unit, Alexandra Hospital, University of Athens, Greece.
authors: A J
authors: AJ
authors: Antsaklis
authors: N E
authors: NE
authors: Papantoniou
authors: G J
authors: GJ
authors: Daskalakis
authors: S A
authors: SA
authors: Mesogitis
authors: S J
authors: SJ
authors: Kitmirides
authors: S S
authors: SS
authors: Michalas
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000097:blood; D006063:Chorionic Gonadotropin / Q000097:blood; D004314:Down Syndrome / Q000175:diagnosis*; D004958:Estradiol / Q000097:blood; D005189:False Positive Reactions; D005260:Female; D005313:Fetal Death / Q000097:blood / Q000517:prevention & control*; D006801:Humans; D011247:Pregnancy; D011256:Pregnancy Outcome; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis / Q000379:methods* / Q000592:standards; D012189:Retrospective Studies; D000509:alpha-Fetoproteins / Q000032:analysis
chemical_list: D015415:Biomarkers; D006063:Chorionic Gonadotropin; D000509:alpha-Fetoproteins; D004958:Estradiol