Ultrasound is a safe, noninvasive procedure that uses sound waves to create images of the fetus, placenta and amniotic fluid. These images can be viewed in real time on a computer monitor by patient and doctor. 
An obstetrical ultrasound is performed several times throughout pregnancy to monitor the growth and development of the fetus. During the first trimester, ultrasound can determine the age of the fetus or detect
any potential birth defects, such as
Down syndrome. Later in the pregnancy,
regular ultrasound exams measure the
size and position of the fetus, placenta
and amniotic fluid to help ensure that
delivery will not have any major
complications.
Ultrasounds are one of the most
commonly performed diagnostic
procedures and have been safely used for years in fetal monitoring.
