Information about nuclear medicine examinations

Before the examination, you will receive patient instructions indicating whether any preparation is required. Most examinations do not require special preparation, but some have very specific instructions.

Preparation depends on the type of examination being performed. Read the patient instructions carefully and well in advance to avoid cancellation due to inadequate preparation. 

If you know or suspect that you are pregnant, inform your treating physician or the staff at the time of the examination. Nuclear medicine examination is only performed on pregnant women in exceptional cases. 

• Patient instructions for examinations

You will be administered a pharmaceutical, which contains a small amount of radioactive material. It is usually given intravenously or into tissue, but may also be administered orally or via inhalation.  

Once in the body, the radioactive pharmaceutical travels through normal circulation and metabolism to the target area, organ, or tissue. 

In some examinations, imaging can begin immediately after radioactive pharmaceutical administration. In others, there may be a waiting period of up to three hours to allow sufficient accumulation of the radioactive pharmaceutical in the target area. 

Due to the radioactive pharmaceutical, the target organ emits localized radiation, which can be imaged. Imaging is performed using a gamma camera (whole-body, regional, or tomographic imaging – SPECT) or a positron emission tomography camera (PET). 

Depending on the examination, imaging may last from 10 minutes to 1–2 hours. 

The amount of radioactivity in the administered pharmaceutical is low, and normal interaction with others is safe. The contrast agent is eliminated from the body within a few hours. However, avoid holding small children or infants in your lap for the rest of the day. 

A nuclear medicine specialist analyzes the images, prepares a report, and sends it to the physician who referred you. The physician who referred you for the examination will inform you of the results and discuss further treatment.

Contact your care unit if you do not have a scheduled appointment or call time. 

Although radioactive pharmaceuticals are used in nuclear medicine examination, the radiation dose and any potential risk from radiation are small. The devices that measure radioactive radiation are highly sensitive and can detect very small amounts of radiation. Allergic reactions occur very rarely in nuclear medicine examinations. 

If you have concerns about radiation, you can always ask your treating physician or the examination unit staff for more information. 

Watch the video: Radiation Safety ABC – Nuclear medicine examination. The video is produced by OYS and includes subtitles in Finnish and Swedish.