PT - JOURNAL ARTICLE AU - Tianhua Huang AU - Shelley Dougan AU - Mark Walker AU - Christine M. Armour AU - Nan Okun TI - Trends in the use of prenatal testing services for fetal aneuploidy in Ontario: a descriptive study AID - 10.9778/cmajo.20180046 DP - 2018 Oct 01 TA - CMAJ Open PG - E436--E444 VI - 6 IP - 4 4099 - http://www.cmajopen.ca/content/6/4/E436.short 4100 - http://www.cmajopen.ca/content/6/4/E436.full SO - CMAJ2018 Oct 01; 6 AB - Background: In 2014, Ontario augmented its publicly funded multiple-marker screening program for prenatal aneuploidy by incorporating cell-free fetal DNA (cffDNA) analysis for high-risk pregnancies. We assessed trends in the use of multiple-marker screening, cffDNA screening and prenatal diagnostic testing before and after implementation of public funding.Methods: We conducted a descriptive study based on data from the Better Outcomes Registry & Network (BORN) Ontario. The study population included all pregnant women in Ontario with a singleton pregnancy and an expected date of delivery between July 1, 2012, and Mar. 31, 2016, with pregnancy data captured in BORN. Pregnancy losses and terminations before 20 weeks’ gestation not captured in BORN were excluded. We generated descriptive statistics to show trends and regional variations in use.Results: The study sample included 534 210 singleton pregnancies. After cffDNA screening was funded for specific indications, uptake of multiple-marker screening increased slightly, from 66.5% to 68.1% (p < 0.001). Uptake of cffDNA screening among women with a positive multiple-marker screening result increased substantially, from 3.2% to 48.8% (p < 0.001). In contrast, the rate of prenatal diagnostic testing in this group decreased from 54.8% to 30.8% (p < 0.001). Although women aged 40 years or older are eligible for primary cffDNA screening, only a small decrease in the use of multiple-marker screening was observed in this group. The greatest use of cffDNA screening and greatest decline in prenatal diagnostic testing were seen in women with a level of risk for trisomy 21 of 1:101–1:200 based on multiple-marker screening.Interpretation: After public funding of cffDNA screening was implemented in Ontario, there was a significant increase in cffDNA screening and a significant decrease in prenatal diagnostic testing among women with a positive multiple-marker screening result. These changing patterns show the significant impact of public policy and funding decisions on women’s choices regarding prenatal testing.