First ultrasound study

Zoomed transabdominal
Modality: Ultrasound (Zoomed transabdominal)

- “ On the first study, the difference between the mean sac diameter (14 mm) and the embryo crown rump length (12 mm) is less than 5 mm. Since the dif...”

Used in the following article:

  • Mean sac diameter - “ Mean sac diameter (MSD) is a sonographic measurement of the gestational sac which is usually first seen at around 3 weeks after conception (5 week...”
  • Small gestational sac - “ A small gestational sac in early first trimester is considered a poor prognostic factor. Some authors use the mean sac diameter to crown rump leng...”
  • Gestational sac - “ The gestational sac (GS) is the first sign of early pregnancy on ultrasound and can be seen with endovaginal ultrasound at approximately 3-5 weeks...”

View full size version of First trimester oligohydramnios

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