What is an Ultrasound for Pregnancy?
An ultrasound exam, or sonogram, is a simple procedure that typically takes on a few minutes. The ultrasound tech uses a small, handheld device called a transducer, which is moved back and forth across the woman's abdomen. The transducer sends out sound waves that, as they bounce off the fetus, create an image on the monitor.
Another ultrasound tool is a transducer that is inserted vaginally rather than being moved externally across the abdomen. Transvaginal ultrasound provides pictures of very early fetal development that may not be obtainable using traditional ultrasound. It is mainly used early in pregnancy.
Ultrasounds are used to determine the age and size of the fetus, and it may be ordered in midpregnancy if there is some question about the actual due date. A sonogram can show the location of the placenta, the presence of certain abnormalities, and multiple fetuses. In some instances, a sonogram may also indicate the sex of the fetus.
Ultrasound is a very useful diagnostic technique. There are no harmful effects.
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