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                                                                                ž By 6 weeks, the embryo can be seen located within the amniotic cavity adjacent to the yolk sac with transvaginal sonography.
ž The documentation of fetal heart activity is performed using motion mode, or M-mode.
ž A tiny heartbeat is often seen before an embryo can be measured, with sonographic documentation of heart activity being present between 5 and 6 weeks.
ž Heart motion can be detected in a 4-mm embryo, with motion certainly evident within the 5-mm embryo.
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