Diagnostic Test
PSMA PET Scan (Prostate-Specific Membrane Antigen)
A PSMA PET scan is a state-of-the-art "heat map" for prostate cancer. It uses a tracer to find cancer cells with high precision. This 3D map helps consultants detect small-volume spread better than traditional scans to guide your treatment plan.
Key Takeaways
- A PSMA PET scan is a state-of-the-art "heat map" for prostate cancer. It uses a tracer to find cancer cells with high precision. This 3D map helps consultants detect small-volume spread better than traditional scans to guide your treatment plan.
- We offer specialist interpretation and related treatments. Book a consultation to discuss your options.
Overview
About PSMA PET Scan (Prostate-Specific Membrane Antigen)
A PSMA PET scan is a state-of-the-art nuclear medicine test. It works like a "heat map" for prostate cancer. A tiny amount of a radioactive "tracer" is injected into your arm. This tracer is specially designed to seek out and stick to a protein called PSMA, which is found in high amounts on the surface of prostate cancer cells.
When this tracer is combined with a CT or MRI scan, it creates a high-definition 3D map that shows your consultant exactly where any cancer might be hiding, with much more precision than traditional X-rays or standard scans.
PSMA PET/CT is more sensitive at detecting small-volume metastases in lymph nodes and bone compared to traditional scans. While highly effective, it is not always needed for low-risk prostate cancer, and in rare cases, other types of tumours might show PSMA uptake.
Test Information
Understanding Your Test
A detailed guide to your diagnostic procedure — from essential preparation and the purpose of the test to safety considerations and what to expect during the process.
When you arrive, a small plastic tube (cannula) will be placed in a vein in your arm to give you the tracer. You will then need to relax quietly in a private room for about 60 minutes—this is the "uptake period," which allows the tracer to circulate and find any cancer cells.
During the scan, you will lie flat on a bed that moves slowly through a large, doughnut-shaped scanner. You must remain very still for about 20 to 40 minutes. The machine makes some humming noises, but unlike an MRI, it is much wider and more open, which usually helps if you don't like small spaces.
The scan is safe, with minimal radiation exposure, similar to, or lower than, conventional imaging.
The scan itself is completely painless. The only minor "ouch" is the quick scratch from the needle when the tracer is injected. Lying still on a flat bed for 30 minutes can feel a bit stiff, but the PET-CT scanner is much more open than a traditional MRI, which usually helps with any "closed-in" feelings.
In the UK, this scan is usually recommended for two main reasons:
Initial Staging: or patients with high-risk prostate cancer, to see if the cancer has spread beyond the prostate.
Recurrence (Biochemical Recurrence): To locate cancer cells when PSA levels rise after initial treatment (surgery or radiation).
Findings often lead to changes in treatment plans, such as targeting specific lymph nodes with radiation or adjusting systemic therapy.
Prostate-specific membrane antigen (PSMA) is a protein found on the surface of most prostate cancer cells. A radiotracer is injected, which binds to these proteins, allowing the PET scanner to identify exactly where the cancer is located, even at low PSA levels.
The scan usually takes less than 2 hours. It involves an injection, a waiting period of about 60 minutes for the tracer to distribute, and a 30-minute scan.
At a glance
Preparation required
- Hydration: Drink plenty of water (about 2 to 3 glasses) in the two hours before your scan to ensure you are well-hydrated.
- Eating: You usually don’t need to fast, but double-check your specific hospital’s appointment letter for any special instructions.
- Exercise: Avoid heavy gym sessions or very strenuous exercise for 24 hours before your scan.
- Clothing: Wear comfortable, warm clothes. Try to avoid items with metal zips, big metal buttons, or underwired bras if possible.
- Medication: Continue taking all your regular pills as normal unless the imaging team tells you otherwise.
Risks or considerations
- Radiation: You will be exposed to a small, safe amount of radiation. The tracer has a short "half-life," meaning it leaves your body quickly, usually through your pee.
- Injection site: You might get a tiny bit of bruising where the needle went in.
- False Positives: Occasionally, the tracer can stick to non-cancerous areas, such as salivary glands or old rib fractures that are healing.
- Safety around others: Because you will be slightly radioactive for a few hours, you may be advised to avoid very close contact with pregnant women or young children for the rest of the day.
What it can help diagnose
- Metastatic Prostate Cancer: Spotting if cancer has moved to distant lymph nodes or bones.
- Local Recurrence: Finding cancer that has returned in the area where the prostate used to be.
- Nodal Involvement: Pinpointing exactly which pelvic lymph nodes are affected.
- Oligometastatic Disease: Finding limited spread that may be suitable for targeted "salvage" radiotherapy.
- Non-PSMA tumours: Identifying the small number of cases (about 5–10%) where the cancer doesn't produce this specific protein and won't show up on this scan.
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Patient Guidance
Frequently Asked Questions
Common questions about this test and what to expect
3 questions
Yes, you will be slightly radioactive for a few hours after the injection. However, the tracer used (like Gallium-68) decays very quickly. As a precaution, UK clinics usually advise avoiding close or prolonged contact with pregnant women and young children for 6 to 8 hours following the test. Drinking plenty of fluids after the scan helps flush the remaining tracer out through your urine.
Reviewed 29 Mar 2026
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While Bone Scans and CT scans are useful, they often miss very small areas of prostate cancer spread. A PSMA PET scan is much more sensitive; it can often detect cancer when the PSA level is very low (e.g., between 0.2 and 0.5 ng/ml), whereas a bone scan might only show results once the PSA is much higher. This allows for earlier, more precise treatment.
Reviewed 29 Mar 2026
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Generally, no. In fact, some evidence suggests that hormone therapy can actually increase the expression of PSMA on cancer cells, making the scan more effective. However, you should always provide a full list of your medications (including any 'LHRH agonists' or 'anti-androgens') to the nuclear medicine department when booking, as protocols can vary depending on the clinical question being asked.
Reviewed 29 Mar 2026
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