A Lexicon for First-Trimester US: Society of Radiologists in Ultrasound Consensus Conference Recommendations

Shuchi K. Rodgers, Mindy M. Horrow, Peter M. Doubilet, Mary C. Frates, Anne Kennedy, Rochelle Andreotti, Kristyn Brandi, Laura Detti, Sarah K. Horvath, Aya Kamaya, Atsuko Koyama, Penelope Chun Lema, Katherine E. Maturen, Tara Morgan, Sarah G. Običan, Kristen Olinger, Roya Sohaey, Suneeta Senapati, Lori M. Strachowski

Research output: Contribution to journalArticlepeer-review

Abstract

The Society of Radiologists in Ultrasound convened a multisociety panel to develop a first-trimester US lexicon based on scientific evidence, societal guidelines, and expert consensus that would be appropriate for imagers, clinicians, and patients. Through a modified Delphi process with consensus of at least 80%, agreement was reached for preferred terms, synonyms, and terms to avoid. An intrauterine pregnancy (IUP) is defined as a pregnancy implanted in a normal location within the uterus. In contrast, an ectopic pregnancy (EP) is any pregnancy implanted in an abnormal location, whether extrauterine or intrauterine, thus categorizing cesarean scar implantations as EPs. The term pregnancy of unknown location is used in the setting of a pregnant patient without evidence of a definite or probable IUP or EP at transvaginal US. Since cardiac development is a gradual process and cardiac chambers are not fully formed in the first trimester, the term cardiac activity is recommended in lieu of ‘heart motion’ or ‘heartbeat.’ The terms ‘living’ and ‘viable’ should also be avoided in the first trimester. ‘Pregnancy failure’ is replaced by early pregnancy loss (EPL). When paired with various modifiers, EPL is used to describe a pregnancy in the first trimester that may or will not progress, is in the process of expulsion, or has either incompletely or completely passed.

Original languageEnglish (US)
Pages (from-to)1-16
Number of pages16
JournalAmerican journal of obstetrics and gynecology
Volume232
Issue number1
DOIs
StatePublished - Jan 2025

All Science Journal Classification (ASJC) codes

  • Obstetrics and Gynecology

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