6-7 weeks: On a transvaginal ultrasound, fetal heart activity can be visualized around 6.5 weeks after the lmp. On a trans-abdominal exam activity will usually be seen between 7-8 weeks depending on patient size and uterine position.
Answered 9/11/2013
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6-7 weeks: A heartbeat is usually detected between 6-7 weeks on the transvaginal sonogram.
Answered 3/1/2019
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