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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.
Frequently Asked Questions
What is an FDG PET scan?
An FDG PET scan is a type of imaging test that helps to diagnose and monitor various conditions by using a radioactive glucose tracer to illustrate metabolic activity in the body.
How should I prepare for an FDG PET scan?
You should avoid eating for 4-6 hours before the scan, stay hydrated with water, avoid strenuous activities prior to the scan, and inform your doctor of any medications you are taking.
Can I take my medications before the scan?
Inform your doctor about all the medications you take. They will advise you if you need to make any adjustments prior to the scan.
How long does an FDG PET scan take?
The entire process, including preparation and imaging, can take 2 to 3 hours. The scan itself usually takes about 30 to 60 minutes.
Is an FDG PET scan safe?
Yes, an FDG PET scan is generally considered safe. The radioactive tracer used has a short half-life and is expelled from the body relatively quickly.
Will the FDG PET scan be painful?
No, the FDG PET scan is not painful, although you may feel a slight discomfort from the injection of the radioactive tracer.
What should I wear to the scan?
Wear comfortable, loose-fitting clothing with no metal zippers or buttons. You may be asked to change into a hospital gown for the procedure.
Can I eat or drink after the FDG PET scan?
Generally, you can resume your normal diet and activities after the scan unless your doctor gives you specific instructions.
How is the radioactive tracer administered?
The radioactive tracer is usually injected into a vein in your arm. It then travels through your bloodstream and accumulates in the targeted tissues.
Can I drive myself home after the FDG PET scan?
Yes, you can drive yourself home unless you have received a sedative or specific instructions from your doctor not to.
Are there any side effects from the FDG PET scan?
Side effects are rare, but you might experience a slight discomfort at the injection site or a mild allergic reaction to the tracer.
What conditions can an FDG PET scan detect?
An FDG PET scan is commonly used to detect cancer, heart disease, brain disorders, and other conditions by showing areas of abnormal metabolic activity.
How do I get the results of my FDG PET scan?
A specialised radiologist will analyse the images and send a report to your doctor, who will then discuss the results with you.
Will I need to avoid contact with others after the scan?
You can generally resume normal contact with others after the scan, but it's a good idea to avoid close contact with pregnant women and young children for a few hours as a precaution.
How much does an FDG PET scan cost?
The cost of an FDG PET scan can vary widely. It is best to check with your healthcare provider or insurance for specific details regarding coverage and out-of-pocket expenses.
Useful Links
Useful links from: Your PET/CT scan at University College Hospital
- NHS: PET scan Provides comprehensive information about PET scans, including what they are, how they work, and what to expect during the procedure.
- University College London Hospitals (UCLH): PET/CT Scan Detailed page about PET/CT scans offered at University College London Hospitals, including preparation instructions and contact information.
- Macmillan Cancer Support: Tests and Scans Information and support from Macmillan regarding various diagnostic tests, including PET scans, particularly focused on cancer diagnosis and treatment planning.
- Cancer Research UK: PET scans Provides detailed information about PET scans, how they are used in detecting cancer, and what to expect during the procedure.
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