The FDG PET Scan: What to expect

The FDG PET Scan: What to Expect

Understanding the FDG PET Scan

The fluorodeoxyglucose positron emission tomography (FDG PET) scan is a diagnostic imaging procedure used to observe metabolic activity within the body. This scan helps in detecting various conditions, including cancers, heart diseases, and brain disorders. By using a special dye containing radioactive tracers, the FDG PET scan highlights active areas of glucose metabolism, which often correlate with disease activity.

Preparing for the FDG PET Scan

Before undergoing an FDG PET scan in the UK, patients are commonly advised to adhere to specific guidelines to ensure accurate results. You may be asked to fast for several hours prior to the scan. Hydration is important, so drinking water is usually permitted. Inform your doctor about any existing medical conditions, medications you are taking, or if you are pregnant or breastfeeding. It's also crucial to avoid strenuous physical activities the day before the scan, as this might affect the results.

During the FDG PET Scan

On the day of the scan, a small amount of FDG tracer will be injected into your bloodstream. You'll be asked to relax and remain still for about an hour to allow the tracer to circulate and be absorbed by your body tissues. During the scan, you will lie on a cushioned table that slides into the PET scanner—a large, cylindrical machine. The scan itself is painless and typically takes between 30 to 45 minutes. The machine will detect the gamma rays emitted by the tracer, producing detailed images of your internal body structures and metabolic activity.

After the FDG PET Scan

Post-scan, patients are usually advised to drink plenty of fluids to help flush the radioactive tracer from their system. The amount of radiation used is very low and generally safe, but it’s best to follow any specific post-scan instructions provided by your healthcare provider. Your doctor will analyse the images to make a diagnosis or to monitor the progress of an existing condition.

Receiving Your Results

FDG PET scan results are typically available within a few days. Your doctor will discuss the findings with you during a follow-up appointment. Understanding these results can help in forming an effective treatment plan or in evaluating the efficacy of ongoing treatments. Always feel free to ask your healthcare provider any questions or express concerns you might have regarding the procedure or your results.