title: [Prenatal diagnosis of trisomy 13 and trisomy 18: the experience of Assaf-Harofe Medical Center].
abstract: BACKGROUND
  Trisomy 18 and 13 are the most common autosomal trisomies, after trisomy 21, and their frequency is rising due to the increased maternal age of pregnant women. The fetuses suffer from multi-organ damage that may lead to many gestational complications as well as short life expectancy.
  
  
  OBJECTIVE
  To assess the indications for prenatal karyotyping of trisomy 13 (T-13, Patau syndrome) and trisomy 18 (T-18, Edwards syndrome) during pregnancy in our medical center.
  
  
  METHODS
  This retrospective cohort study involved all singleton pregnancies locally diagnosed or referred to our Institute because of T-13 and T-18, during the years 1998-2011.
  
  
  RESULTS
  There were 1879 cases of termination of pregnancies (TOPs) because of fetal indications, of them 53 cases of T-18 and 10 cases of T-13. The main indications for prenatal karyotyping in our study group were abnormal sonographic findings during anomaLy scans. In addition, 7 newborns with T-18 and 3 infants with T-13 were born in our hospital during the same period of time. We examined all cases that led to the Live birth of newborns with chromosomal anomalies, stemming from the Lack of extraction of the tests mentioned above and/or ignoring findings that raise suspicion that requires performing prenatal karyotyping during pregnancy.
  
  
  CONCLUSIONS
  Our findings corresponded with other studies and showed that prenatal diagnosis of T-13/T-18 due to abnormal sonographic finding is rising.
  
  
  CONCLUSIONS
  Our study shows that it was possible to identify the vast majority of T-13/T-18 among the pregnant women who had an increased risk based on a combination of the routine screening tests applied in Israel.
authors.forename: M
authors.initials: M
authors.lastname: Naor Dovev
authors.forename: R
authors.initials: R
authors.lastname: Maymon
authors.forename: R
authors.initials: R
authors.lastname: Keidar
authors.forename: O
authors.initials: O
authors.lastname: Reish
authors.forename: Y
authors.initials: Y
authors.lastname: Melcer
authors.forename: Y
authors.initials: Y
authors.lastname: Meltzer
authors.forename: Z
authors.initials: Z
authors.lastname: Vaknin
mesh_terms: D000025:Abortion, Eugenic / Q000379:methods / Q000706:statistics & numerical data; D000328:Adult; D025063:Chromosome Disorders / Q000175:diagnosis / Q000453:epidemiology / Q000235:genetics; D002882:Chromosomes, Human, Pair 13 / Q000235:genetics; D002887:Chromosomes, Human, Pair 18 / Q000235:genetics; D015331:Cohort Studies; D005260:Female; D005820:Genetic Testing / Q000379:methods / Q000706:statistics & numerical data; D006801:Humans; D007557:Israel / Q000453:epidemiology; D007621:Karyotyping / Q000379:methods; D008403:Mass Screening / Q000379:methods / Q000458:organization & administration; D008423:Maternal Age; D011247:Pregnancy; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D014314:Trisomy / Q000175:diagnosis / Q000235:genetics; D000073839:Trisomy 13 Syndrome; D000073842:Trisomy 18 Syndrome; D016216:Ultrasonography, Prenatal / Q000379:methods / Q000706:statistics & numerical data