The Obstetric ultrasonography reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Obstetric ultrasonography

Obstetric ultrasonography is the application of medical ultrasonography to obstetrics. Here, ultrasound is used to visualize the embryo or fetus in its mother's uterus (womb). In the hands of an experienced sonographer, embryos as small as 5mm in length can be visualized. In some countries, routine pregnancy ultrasound scans are performed to detect developmental defects before birth. The sex of the baby can sometimes also be identified.

All current evidence indicates that diagnostic ultrasound is safe for the unborn child, unlike radiographs, which employ ionizing radiation.

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