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High-risk pregnancy: Know what to expect

Specialized ultrasounds

An ultrasound is an imaging test that uses high-frequency sound waves to make images of a fetus on a screen. Ultrasound is safe for both pregnant people and fetuses.

The following kinds of ultrasound may be helpful during a high-risk pregnancy:

  • Three-dimensional (3D) or 4-dimensional (4D) ultrasounds can be used to pinpoint a suspected problem, such as fetal development that's not typical.
  • Ultrasound to measure the length of the cervix can help determine if you're at risk for going into labor early.
  • A biophysical profile is an ultrasound that can be used to check a fetus's health. Depending on the ultrasound results, your team also may check a fetus's heart rate. That procedure is called a nonstress test.