title: Uptake of Noninvasive Prenatal Testing in Chinese Women following Positive Down Syndrome Screening.
abstract: OBJECTIVE
  To investigate how the introduction of noninvasive prenatal testing (NIPT) influenced women's testing choices following a positive Down syndrome screening.
  
  
  METHODS
  A retrospective study was conducted to compare differences in the uptake rates of invasive prenatal diagnosis (IPD) or no testing in one public hospital 1 year before (pre-NIPT) and 1 and 2 years after the introduction of NIPT in private in August 2011 using descriptive analysis and a χ² test. Conventional screening was funded publicly, but NIPT was not. Multivariable binary logistic regression was used to determine factors affecting choices.
  
  
  RESULTS
  In pre-NIPT and in years 1 and 2 after the introduction of NIPT, 306, 362 and 401 women who screened positive were seen, respectively. In year 1 and year 2, 12.6 and 26.7% of them underwent NIPT while IPD was decreased by 16.3 and 25.6%, respectively (p < 0.001). Both chorionic villus sampling and amniocentesis decreased in year 1, but only the former in year 2. However, the rate of declining further testing was similar before and after NIPT (p = 0.213). In multivariable analysis, first trimester screening, nulliparity and working women were significant predictors of accepting NIPT, while only nulliparity was a predictor of declining IPD (OR = 0.61).
  
  
  CONCLUSIONS
  Introduction of NIPT resulted in a significant decrease in IPD for 2 consecutive years..
authors.affiliation: Department of Obstetrics and Gynaecology, Queen Elizabeth Hospital, Hong Kong, SAR, China.
authors.forename: C F
authors.initials: CF
authors.lastname: Poon
authors.forename: W C
authors.initials: WC
authors.lastname: Tse
authors.forename: K O
authors.initials: KO
authors.lastname: Kou
authors.forename: K Y
authors.initials: KY
authors.lastname: Leung
mesh_terms: D000328:Adult; D000649:Amniocentesis / Q000379:methods / Q000639:trends; D044466:Asian People / Q000208:ethnology*; D015193:Chorionic Villi Sampling / Q000379:methods / Q000639:trends; D015331:Cohort Studies; D004314:Down Syndrome / Q000175:diagnosis* / Q000208:ethnology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods / Q000639:trends*; D012189:Retrospective Studies; D016216:Ultrasonography, Prenatal / Q000379:methods / Q000639:trends