What should you know about a normal FDG PET scan?

FDG is a radiotracer taken up by many active cells. The PET part shows tracer distribution, while the CT part provides an anatomical map. A normal report means the radiologist did not identify a concerning uptake pattern or structural finding within the scan’s scope.

Some small, slow-growing or low-activity tumours may not stand out, and inflammation or normal activity can affect appearances. The result is therefore compared with symptoms, examination, prior images and laboratory findings.

Ask what body regions were included and whether the CT portion was diagnostic or mainly for mapping. Keep the report with prior scans and discuss whether another test or clinical review is needed. If the scan was performed to investigate a specific symptom, a normal image may still be one part of a continuing assessment rather than the final explanation.

Seek prompt medical advice for coughing blood, severe breathlessness, new neurological changes, persistent vomiting, severe pain or unexplained rapid deterioration. Emergency help is appropriate for collapse, major breathing difficulty or sudden weakness. A normal scan does not change the need to respond to serious symptoms.

Which areas were scanned? Was FDG uptake interpreted with the CT findings? Does the result address the reason for my referral? Do I need comparison with an older scan, another investigation or symptom follow-up?