RT Book, Section A1 Dooley-Hash, Suzanne A1 Knoop, Kevin J. A2 Knoop, Kevin J. A2 Stack, Lawrence B. A2 Storrow, Alan B. A2 Thurman, R. Jason SR Print(0) ID 1181041724 T1 Failed Intrauterine Pregnancy T2 The Atlas of Emergency Medicine, 5e YR 2021 FD 2021 PB McGraw-Hill PP New York, NY SN 9781260134940 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1181041724 RD 2022/06/28 AB Fetal viability may be in question for some pregnant patients presenting to the ED. Conservative transvaginal US diagnostic criteria for a failed IUP include a crown-rump length of 7 mm with no cardiac activity; a mean GS diameter of ≥ 25 mm and no visible embryo; no heartbeat ≥ 2 weeks after a visualized GS without a yolk sac; no heartbeat ≥ 11 days after a prior documented GS with a yolk sac; and no heartbeat ≥ 2 weeks after a prior documented GS without a yolk sac.