Reasons you may not be able to
have the test or why the results may not be helpful include:
Not being able to hold still during the
procedure. Movement can interfere with the quality of the ultrasound
Having an open wound in the area that needs to be
What To Think About
A radioactive thyroid scan and radioactive
iodine uptake (RAIU) test are nuclear medicine tests that use a radioactive
substance to see how well the thyroid is working and identify thyroid problems.
For more information, see the topic
A thyroid ultrasound does
not use a radioactive substance; it is easier to perform and is less expensive
than a radioactive thyroid scan or RAIU test. But a thyroid ultrasound does not
provide information about how well the thyroid gland is working.
A thyroid ultrasound may be done at the same time as an RAIU
test. RAIU testing is used more often than a thyroid ultrasound to identify
problems such as
hyperthyroidism. A thyroid ultrasound can be used to
identify different types of thyroid problems, especially problems such as
Thyroid nodules are common, especially in women and older
Thyroid ultrasound can usually show the difference between
a cyst, a solid nodule, or another type of mass that needs further testing. A
fluid-filled sac that is smooth and round and that does not have any particles
floating in it is likely to be a simple cyst. A lump that does not have any
fluid or that has fluid with floating particles needs to be checked more
closely. If a solid nodule is found, a thyroid
biopsy may be needed.
Other Works Consulted
Pagana KD, Pagana TJ (2010). Mosby’s Manual of Diagnostic and Laboratory Tests, 4th ed. St. Louis: Mosby.
ByHealthwise Staff Primary Medical ReviewerE. Gregory Thompson, MD - Internal Medicine Specialist Medical ReviewerMatthew I. Kim, MD - Endocrinology