Question 178
{"accessible":false,"alternatives":[{"id":853,"text":"at least 4 mm"},{"id":854,"text":"at least 5 mm"},{"id":855,"text":"at least 6 mm"},{"id":856,"text":"at least 7 mm"},{"id":857,"text":"at least 8 mm"}],"archived":false,"correctAlternativeId":856,"explanation":"\u003cp\u003eA\u0026nbsp;crown-rump length\u0026nbsp;(CRL) of at least 7\u0026nbsp;mm and no heartbeat on a transvaginal scan is one of the current criteria for early pregnancy failure.\u003c/p\u003e\u003cp\u003eIf the embryo has no heartbeat and has a CRL \u0026lt;7 mm, then a follow up scan in 7-14 days may be useful to show that it eventually developed a heartbeat.\u003c/p\u003e\u003cp\u003eIt is important to remember that the measurement must be obtained through an endovaginal approach, not a transabdominal approach. The size cut off for the transabdominal approach is\u0026nbsp;larger.\u003c/p\u003e","id":178,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1125","nextQuestionPath":"/articles/failed-early-pregnancy/questions/23","relatedArticles":[],"alsoUsedIn":[],"stem":"\u003cp\u003eAn embryo without a heart rate may indicate a failed early pregnancy, but what crown rump length (CRL) is necessary to make the diagnosis on transvaginal ultrasound?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/178"}],"attemptsPercentages":[{"alternativeId":"853","percentage":4},{"alternativeId":"855","percentage":12},{"alternativeId":"856","percentage":66},{"alternativeId":"857","percentage":9},{"alternativeId":"854","percentage":9}],"promptToLogin":false,"questionManager":false,"articleId":"failed-early-pregnancy"}