RT Book, Section A1 Cunningham, F. Gary A1 Leveno, Kenneth J. A1 Dashe, Jodi S. A1 Hoffman, Barbara L. A1 Spong, Catherine Y. A1 Casey, Brian M. SR Print(0) ID 1190750800 T1 Ectopic Pregnancy T2 Williams Obstetrics, 26e YR 2022 FD 2022 PB McGraw Hill PP New York, NY SN 9781260462739 LK obgyn.mhmedical.com/content.aspx?aid=1190750800 RD 2024/03/28 AB Following fertilization and fallopian tube transit, the blastocyst normally implants in the endometrial lining of the uterine cavity. Implantation elsewhere is considered ectopic. In the United States, numbers from an insurance database and from Medicaid claims showed ectopic pregnancy rates of 1.54 percent and 1.38 percent, respectively, in 2013 (Tao, 2017). Ectopic implantation accounts for 3 percent of all pregnancy-related deaths (Creanga, 2017). Fortunately, beta-human chorionic gonadotropin (β-hCG) assays and transvaginal sonography (TVS) aid earlier diagnosis, maternal survival, and fertility conservation.