During a salivary gland scan, the tracer liquid is put into a vein (IV) in your arm. The tracer moves through your blood
and into the salivary glands. A special camera takes pictures to show how much
tracer stays in the salivary glands.
Why It Is Done
A salivary gland scan is done
Find the cause of swelling in the major salivary glands. Swelling
may be caused by an infection (abscess),
inflammation, or a pocket of fluid (cyst).
See if a growth in the
parotid gland is a benign tumor or may be cancer.
cause of dry mouth (xerostomia). Several problems can cause
dry mouth, such as a blocked salivary duct, a growth in a salivary gland, or
How To Prepare
Before the salivary gland scan, tell
your doctor if you:
Are or might be pregnant.
breast-feeding. The radioactive tracer used in this test can get into your breast milk. Do not breast-feed your baby for 2 days after this test. During this time, you can give your baby breast milk you stored before the test, or you can give formula. Discard the breast milk you pump for 2 days after the test.
Have had other nuclear scans
recently. If so, the salivary gland scan may need to be delayed.
Talk to your doctor about any concerns you have regarding
the need for the test, its risks, how it will be done, or what the results may
mean. To help you understand the importance of this test, fill out the
medical test information form(What is a PDF document?).
You will need to take off jewelry that may get in the way of the scan.
During a salivary
gland scan, you will sit with the camera placed at your neck. A small amount of
tracer is put in your vein (IV).
camera will scan for radiation released by the tracer. The pictures are taken
every few minutes during the scan. You need to stay very still during the scan
so the pictures are not blurry.
You may be asked to suck on a
lemon after the first pictures are taken. This causes your salivary glands to
release more saliva. Then more pictures are taken.
gland scan takes about 1 hour.
How It Feels
You will not feel pain during the test. You may feel a quick sting or pinch when the IV is put in your arm. The tracer may make you feel warm and flushed.
You may find it hard to lie still during the
There is a slight chance of damage to cells or
tissue from radiation, including the low levels of radiation used for this
test. But the chance of damage from the X-rays is usually very low compared
with the benefits of the test.
The results of a salivary gland scan are usually
available within 2 days.
Salivary gland scan
The tracer moves evenly
through the salivary glands and is released normally into the mouth.
The salivary ducts leading
from the salivary glands are not blocked. Saliva is released in response to
sucking on a lemon.
The tracer does not move
evenly through the salivary glands. A pocket of fluid (cyst), a pocket
of infection (abscess), or a tumor or other growth may be
The tracer may not flow
normally from the salivary glands into the mouth. This may be caused by a tumor
pressing on the duct, a stone in the duct, or inflammation of the
The flow of tracer through the
salivary glands is decreased. This may point to a condition, such as
The amount of tracer in the
salivary glands in front of the ear is greatly increased. This may indicate
inflammation or infection of the parotid glands (parotitis).
What Affects the Test
Reasons you may not be able to
have the test or why the results may not be helpful include:
Pregnancy. A salivary gland scan is not usually
done during pregnancy, because the radiation could harm the
developing baby (fetus).
The inability to stay still during the test.
What To Think About
In North America, a salivary gland scan is
rarely done. Most often, a
CT scan or
magnetic resonance imaging (MRI) is done to look at
the salivary glands. An
ultrasound scan also may be done to look at the
salivary glands. But a salivary scan is the only test that can see how well the
salivary glands are working.
Although a salivary gland scan may be
done to evaluate dry mouth caused by
Sjögren's syndrome, it usually is not used to diagnose
this disease. But a salivary gland scan may be used to diagnose Sjögren's
syndrome in a person who has
Other Works Consulted
Fischbach FT, Dunning MB III, eds. (2009).
Manual of Laboratory and Diagnostic Tests, 8th ed.
Philadelphia: Lippincott Williams and Wilkins.
How this information was developed to help you make better health decisions.