Doppler Ultrasound

Ultrasound, Doppler

What Affects the Test

Factors that can interfere with your test and the accuracy of the results include:

• Bones above the area being studied or gas in the intestines.
• The inability to remain still during the test.
• Extreme obesity.
• Irregular heart rhythms (arrhythmias) or heart disease, which may cause changes in blood flow patterns even though the blood vessels are not abnormal.
• Having a cold arm or leg. Blood flow through that limb may be slowed.
• Having an open wound in the area that needs to be viewed.

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Author:	Jan Nissl, RN, BS	Last Updated: January 17, 2007
Medical Review:	Paul D. Traughber, MD - Radiology Kenneth B. Sutherland, CD, BSc, MD, FRCPC - Diagnostic Radiology
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