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Ultrasound

Definition

A pregnancy ultrasound is an imaging test that uses sound waves to create a picture of how a baby is developing in the womb. It is also used to check the female pelvic organs during pregnancy.

Alternative Names

Pregnancy sonogram; Obstetric ultrasonography; Obstetric sonogram; Ultrasound - pregnancy

How the Test is Performed

To have the procedure:

In some cases, a pregnancy ultrasound may be done by placing the probe into the vagina.

How to Prepare for the Test

You will need to have a full bladder to get the best ultrasound image. You may be asked to drink 2 to 3 glasses of liquid an hour before the test. Do not urinate before the procedure.

How the Test will Feel

There may be some discomfort from pressure on the full bladder. The conducting gel may feel slightly cold and wet. You will not feel the ultrasound waves.

Why the Test is Performed

An ultrasound may be done to determine if there is a problem with the pregnancy, how far along the pregnancy is, or to take measurements and screen for potential problems.

Talk to your health care provider to determine the most appropriate scanning schedule for you.

A pregnancy ultrasound may be done during the first 12 weeks of pregnancy to:

A pregnancy ultrasound may also be done in the second and third trimesters to:

Some centers are now performing a pregnancy ultrasound around 9 - 13 weeks of pregnancy to look for signs of Down syndrome or other problems in the developing baby. This test is often combined with blood tests to improve the accuracy of results.

How many ultrasounds you will need depends on whether a previous scan or blood test has detected problems that require follow-up testing.

Normal Results

The developing baby, placenta, amniotic fluid, and surrounding structures appear normal for the gestational age.

Note: Normal results may vary slightly. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean

Abnormal ultrasound results may be due to some of the following conditions:

Risks

Current ultrasound techniques appear to be safe. Ultrasound does not involve radiation.

References

Richards DS. Obstetrical ultrasound: Imaging, dating, and growth. In: Gabbe SG, Niebyl JR, Simpson JL, et al, eds. Obstetrics: Normal and Problem Pregnancies. 6th ed. Philadelphia, PA: Saunders Elsevier; 2012:chap 9.

Taval VS. Emergency ultrasound. In Marx JA, Hockberger RS, Walls RM, et al, eds. Rosen's Emergency Medicine: Concepts and Clinical Practice. 8th ed. Philadelphia, PA: Mosby Elsevier; 2013:chap 196.



Review Date: 3/11/2014
Reviewed By: Susan Storck, MD, FACOG, Chief, Eastside Department of Obstetrics and Gynecology, Group Health Cooperative of Puget Sound, Bellevue, WA; Clinical Teaching Faculty, Department of Obstetrics and Gynecology, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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