Bone scan Health Article

Definition

A bone scan is an imaging test that shows areas of increased or decreased bone turnover (metabolism).

Alternative Names

Scintigraphy - bone

How the test is performed

A bone scan involves injecting a radioactive material (radiotracer) into a vein. The substance travels through the bloodstream to the bones and organs. As it wears away, it gives off radiation. This radiation is detected by a camera that slowly scans your body. The camera takes pictures of how much radiotracer collects in the bones.

If a bone scan is done to see if you have a bone infection, images may be taken shortly after the radioactive material is injected and again 3 to 4 hours later, when it has collected in the bones. This is called a 3-phase bone scan.

To evaluate metastatic bone disease, images are taken only after the 3 to 4 hour delay.

The scanning part of the test will last about 1 hour. The scanner's camera may move above and around you. You may need to change positions.

You will probably be asked to drink extra water after you receive the radiotracer to keep the material from collecting in your bladder.

How to prepare for the test

You must remove jewelry and other metal objects. You may be asked to wear a hospital gown.

Tell your doctor if you are or may be pregnant.

Do not take any medicine with bismuth in it, such as Pepto-Bismol, for 4 days before the test.