An ultrasound is also sometimes called a sonogram. It is a diagnostic test that uses sound waves to create a visual image of uterus, baby, and placenta. With the help of ultrasound, the 4d ultrasound technician can gather valuable information about the progress of your pregnancy and your baby's health.

During the examination procedure, the sonographer or ultrasound technician transmits high-frequency sound waves through your uterus that bounce off your baby. A computer then translates the echoing sounds into video images that reveal your babys shape, position, and movements.

If you're experiencing a low-risk pregnancy, then you might not be offered an ultrasound at all. In fact, the American College of Obstetricians and Gynecologists recommends ultrasound only when there's a specific medical reason. Without a specific reason ultrasound is not offered to anyone. According to the March of Dimes, about 70 percent of pregnant women in the United States have an ultrasound.

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