What should you know about radioactive after PET scan?

The tracer is designed to be temporary. Your imaging team may give you specific instructions based on the tracer used, your health, and whether you are having another scan or treatment.

A PET scan uses a radiotracer, such as FDG, to show areas of increased metabolic activity. The tracer is different from a treatment dose of radiation and does not remain in the body indefinitely.

You may feel well after the scan because the tracer itself commonly causes no sensation. The scan result still needs interpretation alongside your symptoms, examination, and other imaging. A finding on a PET scan does not by itself identify a specific cancer; inflammation and other active tissues can also affect the image.

Unless your clinician has restricted fluids, drink normally or follow the hydration instructions you were given. Use the toilet when you need to, wash your hands carefully, and follow any department guidance about contact with infants or pregnant people.

Keep the appointment instructions available and tell your care team if you are breastfeeding, pregnant, might be pregnant, or have difficulty passing urine. These details can change the advice you receive.

Contact the imaging department or your clinician if you develop a new or troubling symptom after the scan, or if you cannot pass urine despite needing to. Seek urgent help for severe breathing difficulty, facial or throat swelling, fainting, or rapidly worsening illness.

These symptoms are not expected simply because a scan used a tracer, but they should be assessed promptly. For questions about your result, ask when the report will be reviewed and who will explain it.

Ask which radiotracer was used, how long to follow the department's precautions, and whether you should change drinking or medication routines. You can also ask what the scan was looking for and when the result will be discussed.