![]() The fetal pole should be visualized when the mean sac diameter (MSD) of the gestational sac is at least 25 mm, which typically occurs at the end of 7 weeks or early week 8.Fetal heart rate is approximately between 120-159 bpm late week 7 to early week 8.This can be estimated to occur around week 7. ![]() A fetal pole with a CRL of 7mm or greater should have fetal cardiac activity.It is not necessarily problematic if the fetal pole is not detected if the CRL is less than 5 mm.A typical heart rate is 100-120 beats per minute (BPM). Fetal heart activity may also be detected. On average, the fetal pole can be visualized by transvaginal ultrasound around 6 weeks.The appearance of a only a gestational sac is most likely at this stage.Yolk sac can appear as early as 5 weeks but is more likely around 5.5 weeks. ![]()
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