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Scintigraphy - bone
A bone scan is an imaging test that shows areas of increased or decreased bone turnover (metabolism).
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.
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.
There is a small amount of pain when the needle is inserted. During the scan there is no pain. You must remain still during the examination, and you will be instructed when to change positions by the technologist.
You may experience some discomfort due to lying still for a prolonged period of time.
A bone scan is used to:
Coleman RE, Holen I. Bone metastases. In: Abeloff MD, Armitage JO, Niederhuber JE, Kastan MB, McKena WG, eds. Clinical Oncology. 4th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2008:chap 57
Baker LH. Bone tumors: primary and metastatic bone lesions. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 212.
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