Reasons you may not be able to
have the test or why the results may not be helpful include:
Bones above the area being studied or gas in
the intestines, which may interfere with the pictures.
Not being able to remain still during the
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.
What To Think About
Producing accurate test results with Doppler
ultrasound requires a skilled examiner. The scans are usually read within a
short period of time in case repeat tests are needed.
Doppler ultrasound requires a person to hold very still, some children may need
to be sedated so that their movements do not interfere with the
Angiography and venography are
X-ray tests that require the injection of
contrast material. In many cases, Doppler ultrasound
may be done instead of angiography or venography because it is faster, less
expensive, and noninvasive. If results from a Doppler ultrasound are
inconclusive, an angiography or venography test may be done. Angiography is
usually more accurate than Doppler ultrasound and is considered the most
definitive test for evaluating blood flow through an artery. Magnetic resonance
angiography (MRA) and computed tomography angiography (CTA) may be done instead
of conventional angiography because these tests are less invasive and easier to
perform than conventional angiography. In some cases, venography may be needed
to confirm a suspected vein problem.
Doppler ultrasound may be used to check many body organs. It can also be done
safely during pregnancy.
Other Works Consulted
Chernecky CC, Berger BJ (2008). Laboratory Tests and Diagnostic Procedures, 5th ed. St. Louis: Saunders.
Fischbach FT, Dunning MB III, eds. (2009). Manual of Laboratory and Diagnostic Tests, 8th ed. Philadelphia: Lippincott Williams and Wilkins.
Pagana KD, Pagana TJ (2010). Mosby’s Manual of Diagnostic and Laboratory Tests, 4th ed. St. Louis: Mosby Elsevier.
Roman AS, Pernoll ML (2007). Rh isoimmunization and other blood group incompatibilities section of Late pregnancy complications. In AH DeCherney et al., eds., Current Diagnosis and Treatment Obstetrics and Gynecology, pp. 282–287. New York: McGraw-Hill.