Is a PET scan dangerous?

PET-CT uses a radioactive tracer and CT X-rays. The FDG Radiotracer is administered in a small amount and leaves the body over time. The injection may cause brief discomfort, and reactions are possible. The CT portion adds radiation exposure. Pregnancy, breastfeeding, diabetes, kidney problems, difficulty lying flat, and some medicines may affect the plan or require special instructions. The scan can provide information that changes diagnosis or treatment planning, so the ordering team weighs expected benefit against potential harm for the individual.

Tell the imaging team about pregnancy or possible pregnancy, breastfeeding, diabetes, allergies, kidney disease, recent procedures, and prior imaging. Follow instructions about fasting, exercise, medicines, and blood glucose. Keep still during imaging and report discomfort. Ask whether the CT requires contrast and what preparation applies. The PET-CT Scan page can help you understand the sequence of the visit.

Tell staff immediately if you feel faint, develop wheezing, or notice swelling after the injection. After the appointment, seek emergency help for trouble breathing, collapse, severe weakness, or a rapidly spreading rash. Contact the centre about persistent injection-site pain, swelling, or other symptoms that concern you. The team can advise whether you need assessment and how to arrange it.

Why is PET-CT the right test for my situation? How will pregnancy, breastfeeding, diabetes, or kidney problems change preparation? Is contrast planned? What symptoms should prompt immediate help after the injection? When will the report be reviewed with me?