Doppler Ultrasound
En Español (Spanish Version)

Definition
A Doppler ultrasound is a test that uses sound waves to examine parts of the body. It looks at the motion of fluids in the blood vessels.

Major Abdominal Arteries and Veins

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Reasons for Test
Doppler ultrasound is used to:

  • View the flow of blood through vessels and/or the heart
  • View and evaluate blockages to blood flow, such as clots
  • Assess build-up of plaque inside a vessel
  • Monitor blood flow through repaired blood vessels such as bypass grafts
  • Examine a baby during a pregnancy
Possible Complications
In most cases, there are no complications with this test.

What to Expect
Prior to Test
Your doctor may do the following:

  • A physical exam
  • Blood or urine tests
In some cases your doctor may instruct you to:

  • Fast for 8-12 hours before the test. This will decrease the amount of gas in your intestines and make organs easier to see.
  • Have a full bladder before the test. You may need to drink six or more glasses of water without going to the bathroom.
  • Avoid smoking . Smoking can interfere with test results.
Description of the Test
You will lie on a table. Your doctor will put a gel on the skin over the area that will be examined. The gel helps the sound waves travel between the machine and your body.

The ultrasound machine has a hand-held instrument called a transducer. It looks like a microphone or wand. The transducer is pushed against your skin where the gel was applied. The transducer sends sound waves into your body. The waves bounce off your internal organs and echo back to the transducer. The echoes are changed into images that are shown on a screen. The doctor examines the images on the screen. Photographs of the images may be taken.

You may be asked to change positions or hold your breath during the exam.

Ultrasound of Abdomen

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After Test
The gel will be cleaned from your body. You will be able to return to normal activities in most cases.

How Long Will It Take?
About 30 minutes to 1 hour

Will It Hurt?
No

Results
A radiologist will examine the images after the test. Your doctor will let you know the results and talk to you about treatment.

Call Your Doctor
After the test, call your doctor if symptoms become worse.

In case of an emergency, call for medical help right away.




RESOURCES:
American Institute of Ultrasound in Medicine

RadiologyInfo.org—Radiologic Society of North America

CANADIAN RESOURCES:
The College of Family Physicians of Canada


References:
Doppler. Radiological Society of North America Electronic Journal website. Available at: http://ej.rsna.org/ej3/0079-98.fin/doppler.htm. Accessed November 19, 2012.

General ultrasound imaging. Radiologic Society of North America Radiology Info website. Available at: http://www.radiologyinfo.org/en/info.cfm?PG=genus . Updated July 2, 2012. Accessed November 19, 2012.

Radiation-emitting products. US Food and Drug Administration website. Available at: http://www.fda.gov/Radiation-EmittingProducts/RadiationEmittingProductsandProcedures/MedicalImaging/ucm115357.htm. Updated June 6, 2012. Accessed November 19, 2012.

Last Reviewed March 2014



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