What is a breast scan?
A breast scan is an imaging test to look at your breasts. It may also be called a
scintimammography or nuclear medicine breast imaging. It's used when a mammogram hasn't
given your healthcare provider enough information. It's not considered a primary test
for screening and doesn't replace the need for a mammogram.
A breast scan is a type of nuclear imaging test. This means that a tiny amount of
a radioactive matter is used during the scan. The radioactive matter called tracer
sends out gamma rays. These are picked up by the scanner to make a picture of your
The areas of the breast where the radioactive tracer collects in greater amounts are
called hot spots. The areas that don't absorb the tracer and appear less bright on
the scan image are referred to as cold spots. Cancer cells are usually found by hot
spots in a breast scan.
A breast scan can be helpful in diagnosing breast cancer in younger women. Younger
women usually have denser breasts than older women. Denser breast tissue can also
happen because of:
Past breast surgery
Why might I need a breast scan?
You may need a breast scan if the results of a mammogram are uncertain. Or your healthcare
provider may use a breast scan along with mammography or as a follow up to breast
exams or ultrasounds.
Your provider may order a breast scan to:
Look for a tumor
See how well blood is flowing through your breast tissue
Follow up after surgery, chemotherapy, or other breast cancer treatment
Your provider may have other reasons to recommend a breast scan. Talk with your provider
about the reason for your scan.
What are the risks of a breast scan?
The risk from the radioactive tracer is very low. The amount used in the test is very
small. You may feel some slight discomfort when the tracer is injected. Allergic reactions
to the tracer are rare, but they may happen.
Lying on the scanning table during the procedure may cause some discomfort or pain
for certain people.
Tell your healthcare provider if you are:
Allergic to or sensitive to medicines, contrast dyes, or latex
Pregnant or think that you might be pregnant. The scan may not be safe for the fetus.
Breastfeeding. The tracer may contaminate your breastmilk.
Are about to start your period. A scan done at this point may not be accurate.
Have any other health conditions
You may have other risks. Discuss any concerns with your provider before the procedure.
How do I get ready for a breast scan?
Your healthcare provider will explain the procedure to you. Ask your provider any
questions that you may have.
Make a list of questions you have about the procedure. Discuss these questions and
any concerns with your provider before the procedure. Consider bringing a family member
or trusted friend to the medical appointment to help you remember your questions and
You may be asked to sign a consent form that gives permission to do the procedure.
Read the form carefully and ask questions if anything isn't clear.
You don't need to stop eating or drinking before the test. You also won't need medicine
to help you relax (sedation).
Tell your provider:
If you're allergic to or sensitive to latex, medicines, contrast dyes, or iodine
If you're pregnant or think you may be pregnant
About all the prescriptions and over-the-counter medicines and supplements you're
Tell the technologist if you have breast implants.
Follow any other instructions your provider gives you on how to get ready.
What happens during a breast scan?
You may have a breast scan as an outpatient or as part of your stay in a hospital.
The way the test is done may vary depending on your condition and your healthcare
Generally, a breast scan follows this process:
You'll be asked to remove all jewelry and clothing above the waist. You'll be given
a gown to wear.
An IV (intravenous) line will be started in your arm or hand opposite the breast to
be looked at. If both breasts are being looked at, the IV may be started in a vein
in a foot.
The tracer will be injected into the IV. You may have a slight metallic taste after
the injection. This should last only a few moments.
You may be placed in different positions, depending on the type of machine being used.
You may lie face down on a special table made for breast scans. The breast to be scanned
will be placed through an opening in the table. Or you may have 1 of your breasts
placed next to the camera of the scanner and compressed with a flat plate, just as
with a mammogram. One breast is scanned and then the other breast is scanned. Some
machines have cameras on each side of the breast.
The technologist will start taking images a few minutes after the injection. They'll
place the scanner over the breast. Or the technologist may use at different kind of
scan called SPECT.
You may be asked to change positions during the scan. For example, you may lie on
your back or sit up. You may be asked to sit with your arms straight out or above
When the scan is done, the IV will be removed.
The breast scan is not painful. But you may have some discomfort or pain from lying
still during the test. This may be because of recent surgery or a joint injury. The
technologist will use all possible comfort measures and do the scan as quickly as
possible to minimize any discomfort or pain.
What happens after a breast scan?
You should move slowly when getting up from the scanner table to avoid any dizziness
You may be told to drink plenty of fluids and empty your bladder often for 1 to 2
days after the scan. This will help flush the radioactive tracer from your body.
The medical staff will check the IV site for any signs of redness or swelling. Tell
your healthcare provider if you see any pain, redness, or swelling at the IV site
after you go home. These may be signs of infection or another type of reaction.
You may go back to your usual diet and activities as directed by your provider.
Your provider may give you other instructions, depending on your situation.
Before you agree to the test or the procedure make sure you know:
The name of the test or procedure
The reason you are having the test or procedure
What results to expect and what they mean
The risks and benefits of the test or procedure
What the possible side effects or complications are
When and where you are to have the test or procedure
Who will do the test or procedure and what that person’s qualifications are
What would happen if you did not have the test or procedure
Any alternative tests or procedures to think about
When and how you will get the results
Who to call after the test or procedure if you have questions or problems
How much you will have to pay for the test or procedure