Over a two to four hour time period the tracing element collects in the bones. The scanner collects the distribution of the rays and transmits the information to a computer, which produces a permanent image. Although the test itself is not painful, the injection site may be tender to the touch. The scan will last about an hour and may require the patient to change positions on the table. The results of the test reveal 'hot' and 'cold' spots.
Cold spots appear light and indicate the bone absorbed less of the tracing element.
If a patient is hypersensitive or has known allergies, this should be discussed with the referring physician prior to the bone scan. The test may be postponed if the patient is pregnant or nursing. This substance breaks down quickly and is eliminated from the body in one to two days. Rarely will the study by itself make the diagnosis.