How does a bone scan work?
A bone scan works by using a radiotracer injection. The
radiotracer gathers in areas where cells show signs of change or
irregular activity. Changes in cells could indicate cancer or other
diseases. A large scanner called a gamma camera takes images of your
body. The gamma images show “hot spots” or areas where the radiotracer
has collected.
How do I prepare for a bone scan?
Your care team gives you specific instructions for a bone
scan. Most people don’t need to do anything special. You can typically
eat and drink as usual and take your regular medications unless your
provider says otherwise.
You’ll need to remove any objects containing metal from your body, like
jewelry or belts with metal buckles. Tell your provider if you have a
metal joint implant, dental implant or pacemaker. They can help
determine whether a nuclear bone scan is safe for you.
Pre-Test
Before the actual scan can be done, the radioactive tracer must be
injected. The IV is placed using sterile technique as follows:
- Once you are positioned on the examining table, a nurse or
technologist inserts a flexible IV catheter into a vein in your arm
or hand. You may experience fleeting, minor pain as the needle is
inserted.
- The tracer is then injected into the IV, during which you may
feel a cold sensation moving up your arm, but likely no pain. From
start to finish, the infusion process takes around 10 to 15 minutes.
- You're then free to move around while the tracer circulates in
the bloodstream and begins to be absorbed in bone. During this
waiting period, you will need to drink four to six glasses of water
to flush any excess tracer not absorbed by cells. You can eat and do
anything else you’d like during this time.
If you plan to leave, let the nurse or technologist know. He or she will
be able to tell you when you need to return. Check in with reception
when you do.
What can I expect during a bone scan?
On the day of your scan, you should plan to be in the hospital or
imaging center for several hours.
During the test:
- The technologist injects the radiotracer into one of your arm
veins.
- You wait one to four hours while the radiotracer circulates
throughout your body and reaches your bones. You won’t feel the
radiotracer moving through your bloodstream.
- You may need to drink several glasses of water and urinate
frequently to help flush excess amounts of the radiotracer that your
bones don’t absorb.
- The technologist takes you into the testing room, and you lie on
your back on an exam table.
- A large camera moves over your body and takes images.
- You may need to hold your breath for a few seconds to prevent
blurry images. The technologist may also ask you to change positions
so they can take pictures from multiple angles.
How long does a bone scan take?
The test itself usually takes around 30 to 60 minutes. But you spend
several additional hours in the hospital or imaging center while the
radiotracer circulates in your bloodstream.
What can I expect after a bone scan?
You
should be careful when rising from the scanning table since you will
have been lying on your back for a long time. It is best to prop
yourself on your elbows, wait a moment, push yourself into a seated
position, and wait another moment before hopping off the table. This is
especially true if you have low blood pressure or existing back, leg, or
hip pain. The technetium-99m injection can also sometimes cause a drop
in blood pressure, which can leave you lightheaded.
Once your scan is complete, you may be asked to wait until the
technologist conducts a final review of the images. If more images are
needed, you may be asked to return. Don’t let this worry you. More often
than not, it is simply because the image resolution wasn’t sharp enough
or the positioning of the camera needed adjustment. It doesn’t mean that
the technologist found something worrisome.
After the technologist tells you that the scanned images are acceptable,
you can change back into your regular clothes and leave. Double check to
ensure you have all of your belongings.
Once home, call your healthcare provider if you experience any unusual
symptoms or side effects, including irregular heartbeat, chest pains,
fever, chills, or vomiting.
Despite having been injected with a radioactive substance, you will not
be harmful to anyone who touches, kisses, or stands close to you. Sexual
intercourse is also safe.
What are the risks and side effects?
This is a safe test for most people. The radiotracer dose is so small
that you don’t usually need to take special measures to avoid exposing
others to radiation. You may need to stay an arm’s length away from
higher-risk people for about 24 hours. This may include babies, children
and pregnant women.
Tell your healthcare provider if you’re nursing, pregnant or think you
could be. A bone scan isn’t safe for you if you're pregnant
or breastfeeding.
Most people have no side effects of a bone scan. The test
isn’t painful, except for a minor sting or prick when the technologist
injects the radiotracer. You may have some mild bruising or swelling in
your arm where you received the radiotracer injection. This usually goes
away within a few days.