Can a transvaginal ultrasound confirm a missed miscarriage?

May 13, 2025 Source: Cainiu Health

Dr. Zhang Lu

Introduction

Transvaginal B-mode ultrasound examination has high accuracy in diagnosing fetal demise. If, during the ultrasound examination, the physician observes no fetal heartbeat or discrepancies between fetal size and gestational age, and if these findings are consistent across multiple consecutive examinations, transvaginal B-mode ultrasound can serve as one of the bases for diagnosing fetal demise. However, specific diagnosis must be comprehensively determined according to the stage of pregnancy and results of other examinations.

　　Transvaginal ultrasound refers to B-mode ultrasound examination via the vagina. Under normal circumstances, transvaginal B-mode ultrasound has high accuracy in diagnosing fetal demise, but specific situations must be comprehensively assessed based on the stage of pregnancy and results of other examinations. Detailed analysis is as follows:

　　

　　Transvaginal B-mode ultrasound allows clear observation of embryonic development, including fetal heart activity. If during the examination, the physician observes no fetal heart activity or if the fetal size does not correspond with the gestational age, and if consistent results are observed over multiple examinations, transvaginal B-mode ultrasound can serve as one of the bases for diagnosing fetal demise.

　　Clinically, other diagnostic methods such as blood HCG testing, complete blood count (CBC), and fetal heart monitoring are usually combined to further confirm the diagnosis. Additionally, if the pregnant woman is in the early stages of pregnancy and the embryo has not yet developed to the point where fetal heart activity can be clearly observed, a single transvaginal B-mode ultrasound may not be sufficient to immediately confirm fetal demise.

　　During pregnancy, expectant mothers should undergo regular prenatal checkups, follow medical advice, and promptly monitor their own health status and fetal development.

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