Preparing for Your Scan
Should I Avoid Exercise — Before a PET-CT Scan?
Active muscles absorb the same radioactive tracer that makes tumours visible on a PET-CT. Exercise in the hours before your scan can make results harder to read — or mean the scan has to be repeated.
Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026
- Muscle competes with tumour — Exercised muscle absorbs the glucose tracer the same way cancer cells do, which can hide or mimic disease on the scan.
- The standard window is 24 hours — SNMMI and EANM practice guidelines both treat 24 hours as the minimum rest period before a PET-CT.
- Light movement is different from exercise — Slow walking around the home is generally acceptable. Deliberate, heart-raising activity is not.
- Staying still after injection matters too — Once the tracer is given, rest quietly in the waiting area. Movement in that window distributes tracer into your muscles.
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Yes. Stop strenuous exercise at least 24 hours before your PET-CT scan. Active muscles absorb the radioactive glucose tracer the same way tumours do, which can obscure what the scan is looking for. Your imaging centre will confirm the exact preparation window when they call to book your appointment.
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Which activities do you need to stop, and when?
| Activity | Examples | Guidance |
|---|---|---|
| Strenuous exercise | Running, gym workouts, cycling, swimming laps, heavy lifting | Stop at least 24 hours before your scan. SNMMI and EANM guidelines treat this as the minimum rest window. |
| Moderate activity | Brisk walking, yoga, dancing, light cycling | Avoid the day before your scan where possible. Check with your imaging centre if you are unsure. |
| Light daily movement | Slow walking at home, one flight of stairs | Generally acceptable. Tell your centre if your day was unexpectedly physical. |
| Morning of the scan | Any deliberate exercise | Do not exercise before leaving for the centre. Walk only as much as getting there requires. |
| After your tracer injection | Any unnecessary movement | Sit or lie still in the waiting area. Moving after injection sends tracer into active muscles. |
Why does exercise affect the scan result?
The tracer used in a PET-CT is a radioactive form of glucose. Your body distributes it to cells that are actively using energy.
Cancer cells use glucose at a higher rate than most healthy tissue. That difference is what makes a tumour visible on the scan.
When you exercise, your muscles become heavy consumers of glucose too. They absorb the tracer alongside — or instead of — tumour tissue, creating bright areas in muscle that can look like disease, or hide it entirely.
A scan affected by muscle uptake may need to be repeated. Avoiding exercise before the scan is the simplest way to protect the result.
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PET-CT Scan Centres in Hyderabad
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What to do in the 24 hours before your scan
Mark your stopping time
Note your exact scan appointment time. Count back 24 hours from there — that is when strenuous exercise must stop.
Finish any workouts well before that point
This includes running, gym sessions, cycling, swimming, and any heavy physical work. Finishing early is better than cutting it close.
Keep the evening before quiet
Avoid brisk walking, yoga, or any activity that noticeably raises your heart rate. Slow movement around the home is fine.
On the morning of the scan, move only as needed
Do not exercise before leaving for the centre. Walk from the car or auto to the entrance and no more.
After your tracer injection, rest completely
You will sit or lie quietly for the uptake period after the injection is given — your centre will tell you how long. This is part of the scan preparation, not just waiting. Movement in this period affects where the tracer goes.
Did you know?
On a PET-CT, recently exercised muscle can show uptake levels that look similar to active tumour tissue.
A patient who exercises the morning of their scan may arrive in time, receive a perfect injection, and still leave with a result that cannot be relied upon — because of what happened before they arrived.
Source: SNMMI Procedure Standard / EANM Practice Guideline for FDG PET-CT in Oncology
CION does PET-CT in Hyderabad from Rs 10,499 — among the lowest published prices in the city — including an oncologist-reviewed report and a free Rs 950 consultation. Indicative price, as of September 2026.
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Common questions
Frequently asked questions
Does walking count as exercise I need to avoid?
Normal slow walking — around your home, to the bathroom, from the car to the centre — is not what the restriction is designed to prevent. The concern is activity that significantly raises your heart rate or puts your muscles under sustained effort. Brisk walking, walking uphill, or covering long distances should be avoided the day before your scan. If you are uncertain, slow down and tell your imaging centre if your day was more active than planned.
What if I exercise every day — can I just reduce rather than stop?
Reducing is not the same as stopping. Muscle that has worked hard absorbs the tracer even if the session was shorter than usual. SNMMI and EANM guidelines treat the 24-hour rest period as a minimum, not a threshold you can partly meet. If stopping exercise for a day creates a medical concern — because of your heart condition or another reason — speak to your oncologist or the imaging centre before your scan date, so they can advise.
I forgot and exercised this morning. Should I still come?
Call the imaging centre before you leave for your appointment. They will decide whether to proceed or reschedule — that is their call to make, not yours to guess at. Do not simply not attend without calling, because an unused slot delays someone else. In some cases, depending on what you did and how long before the scan, the result may still be usable. Only the centre can make that judgement.
Why do I need to sit still after the tracer injection?
The tracer is absorbed by whichever cells are most active in the period immediately after injection. If your muscles are working — even fidgeting, talking animatedly, or walking to the bathroom unnecessarily — they take up more tracer than they would at rest. Sitting still during the uptake period is part of preparing the scan, not just a waiting-room rule. Your imaging team will tell you what movement is and is not acceptable during that time.
Are there other preparation steps I should follow?
Yes. Fasting, avoiding sugary foods and drinks, and in some cases pausing specific medications are all part of PET-CT preparation. Your imaging centre will go through these with you personally at the time of booking, because the details depend on the type of scan and your individual health. If you have diabetes or reduced kidney function, your preparation may differ from the standard instructions — route those questions to your treating team rather than following a general list.