Bone scan

A bone scan looks for changes in your bones.

Before the test you have a radioactive tracer injection into your bloodstream. You have this through a tube (cannula) into a vein in your hand. It takes 2 to 3 hours for the tracer to go around the body.

To have the scan you lie down on a couch while the scanner takes pictures. The scan takes 30 minutes to an hour. It is painless and you can go home after the scan. The body gets rid of the tracer through your urine over the next day.

A bone scan shows up changes or abnormalities in the bones. It is also called:

  • a radionuclide scan
  • bone scintigraphy
  • nuclear medicine bone scan

A bone scan can look at a particular joint or bone. In cancer it is more usual to scan the whole body.

A large camera (called a gamma camera) scans you and picks up radioactivity. 

Photograph of a man having a bone scan

You have the scan in either the medical physics, nuclear medicine or x-ray department at the hospital. The scan can take between 30 to 60 minutes, but you'll be at the hospital for several hours. 

If there are changes on the scan they may be called hot spots. These are not always cancer. Bone changes can happen for other reasons like arthritis. You might need to have a CT scan to know exactly where these abnormal areas are. 

Preparing for your bone scan

You can eat and drink normally before your scan. Take your medicines as normal unless your doctor tells you otherwise.

Phone the department where you are having the scan if you are pregnant or breastfeeding. You might have to stop breastfeeding for a short period of time after having the scan. So you might want to store enough expressed milk for 1 or 2 feeds beforehand. The staff at the department will advise you.

You have to arrive at the hospital about 4 hours before your scan. Your appointment letter will tell you the exact time.

Tell the department beforehand if you have difficulties passing urine, need to pass urine urgently, or have prostate related problems. 

What happens

At the hospital

When you arrive at the department the radiographer explains what will happen and asks you to sign a consent form. Ask them questions if anything is unclear.

They give you an injection of a radioactive liquid called a radionuclide or radioactive tracer. They inject it through a small tube (cannula) in a vein in your arm or back of your hand. It’s a small amount of radiation. 

You might have a test scan immediately after the injection. But normally you wait 2 to 3 hours while the radioactive tracer travels through the blood and collects in your bones.

The radioactive tracer tends to collect more in areas where the bone is breaking down and repairing itself. These areas of activity (called hot spots) show up on the scan. They look darker than other areas of bone.

Diagram showing bone scan hot spots

Waiting for the scan

Your radiographer asks you to drink plenty while you wait for your scan. This flushes the radioactive tracer around your body. If you have problems with passing urine you might get different instructions. 

You might be able to have a walk in the hospital grounds while you are waiting. Or you may need to wait in a separate area with other people having nuclear medicine tests. Because of the small amount of radiation from the radioactive tracer you might need to use separate labelled toilets.

Take a look at this short video about having a bone scan. 

Having the bone scan

You usually wear your own clothes for the scan but some hospitals may ask you to change into a hospital gown. Your radiographer will ask you to empty your pockets and remove any metal objects such as keys, coins, belts, braces and jewellery.

You lie down on a couch and have to keep very still while you go through the scanner. The camera takes pictures of the bones in your whole body.

Let your radiographer know beforehand if you think this will be a problem for you. Tell them if you start to feel closed in or claustrophobic. They can help to reassure you.

The scan can take between 30 minutes to an hour.

After your bone scan

You should be able to go home soon after the scan. You need to drink plenty for the rest of the day to help flush the radioactive tracer out of your body. Your body gets rid of it through the urine, usually within 24 hours.

A very small amount of radioactive tracer is left in your body for a short time after your scan. So for the rest of the day keep any time you spend within arm's length of pregnant women, babies or young children as short as possible. 

Air travel after a bone scan

Airports have sensitive radiation monitors which might pick up the trace of radiation after your test. As a precaution take your appointment letter with you if you're travelling within a week of your scan. Then you can show the staff that the radioactivity is due to a scan. 

Possible risks from having a bone scan

A bone scan is a safe test for most people but like all medical tests there are possible risks. Your doctor and radiographer make sure the benefits of having the test outweigh these risks.

Bruising and swelling

You might get a small bruise around the area where they put the needle in.

There is a risk that the radioactive tracer will leak outside the vein. This can cause swelling and pain in your arm, but it's rare and gets better quickly. 


Contact the department if you are due to have a bone scan and you are pregnant or breastfeeding. The staff will tell you if you need to stop breastfeeding for a time after having the radioactive tracer. 

You might not be able to have a bone scan if there is a possibility that you might be pregnant. This is because the radioactive tracer could affect the developing baby.


Exposure to radiation during a bone scan can slightly increase your risk of developing cancer in the future. Talk to your doctor or radiographer if this worries you.

Getting your results

Your scan will be looked at by a specialist doctor and you should get your results within 1 or 2 weeks. You won't get any results at the time of the scan. 

Waiting for results can make you anxious. Ask your doctor or nurse how long it will take to get them. Contact them if you haven’t heard anything after a couple of weeks.

You might have the contact details for a specialist nurse. You can contact them for information and support if you need to. It may help to talk to a close friend or relative about how you feel. 

For information and support, you can also call the Cancer Research UK nurses on freephone 0808 800 4040. The lines are open from 9am to 5pm, Monday to Friday.

More information

We have more information on tests, treatment and support if you have been diagnosed with cancer.

  • The EANM practice guidelines for bone scintigraphy
    T Van den Wyngaert and others
    European Journal of Nuclear Medicine and Molecular Imaging, 2016. Volume 43, Pages 1723 - 1738

  • Clinical Guideline for Bone Scintigraphy
    C Fowler
    British Nuclear Medicine Society Professional Standards Committee, 2014

  • Cancer: Principles and Practice of Oncology (11th edition)
    V T De Vita, T S Lawrence and S A Rosenberg
    Wolters Kluwer, 2019

  • Going for a nuclear medicine test - Bone scan
    British Nuclear Medicine Society, accessed July 2022

Last reviewed: 
27 Jul 2022
Next review due: 
27 Jul 2025

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