Weight loss investigation
PET-CT for — Unexplained Weight Loss
Being referred for a PET-CT can feel alarming. It does not mean your doctor has decided you have cancer. It means other tests have not yet explained your weight loss, and this scan may find something they could not.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026
- Other tests usually come first — Blood tests and ultrasound answer most cases. A PET-CT is ordered when those have not found the cause.
- Not automatically a cancer scan — PET-CT finds infection, inflammation, and other conditions alongside malignancy.
- A cancer centre, not a cancer diagnosis — CION carries out PET-CT for many non-cancer indications. Being referred here is not a verdict.
- Your referring doctor leads — CION performs the scan. The doctor who referred you interprets the result in the context of your full history.
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A PET-CT is ordered for unexplained weight loss when initial tests have not found the cause. It is not automatically a cancer scan — it looks for any area of unusual metabolic activity, including infection or inflammation. Your referring doctor has decided this is the right next step for you.
At CION, a whole-body PET-CT starts from Rs 10,499 — among the lowest published prices in Hyderabad. Indicative price, as of September 2026.
What is a PET-CT actually looking for?
A PET-CT combines two scans into one. The CT part shows the body's structure. The PET part shows how active different areas are, by tracking where a small amount of radioactive tracer goes after it is injected.
When your doctor orders it for weight loss, they are asking the scan to find any area that is consuming more energy than expected. That pattern can point to infection, inflammation, or a growth that other tests have not found.
A finding on PET-CT does not automatically mean cancer. Many non-cancerous conditions — including tuberculosis, sarcoidosis, and inflammatory bowel disease — can show up as areas of high activity. The scan raises possibilities; your referring doctor decides what they mean.
Why do other tests usually come before a PET-CT?
Blood tests and ultrasound answer most cases of unexplained weight loss at far lower cost and with less radiation. These are almost always done first.
A PET-CT is ordered when those investigations have not found an explanation, or when your doctor needs a whole-body picture that routine scans cannot provide. CION coordinates your PET-CT through partner imaging centres; the decision about when you need the scan belongs to the doctor who referred you.
If you are unsure why you are having this scan now, or what happens after the result, ask the specialist who ordered it. They know your full history. CION does not make that clinical decision on your behalf.
PET-CT Partner Centres
PET-CT Scan Centres in Hyderabad
CION offers PET-CT scans through 4 trusted partner PET-CT centres across Hyderabad, so you can choose the one closest to you. Call 18002028726 and we’ll guide you to the earliest available appointment.
PET-CT Centre — Punjagutta
PET-CT Centre — Himayatnagar
PET-CT Centre — Narayanaguda
These are partner diagnostic centres within the CION network. Toll-free booking: 18002028726.
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Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Does being sent to a cancer centre mean my doctor suspects cancer?
No. CION performs PET-CT for a wide range of conditions that are not cancer. Unexplained weight loss is one of them. Many people who have this scan turn out not to have a malignancy.
A PET-CT is a tool for answering an open question, not a verdict in advance of the result. This page is for general information only. It is not a cancer diagnosis, and it does not predict what your scan will find.
Whatever the result shows, your referring specialist — not CION — is responsible for explaining it to you and deciding what happens next.
What to tell the team before your scan
- Whether you have diabetes or take insulin — blood sugar levels affect how the tracer distributes through the body
- Any recent infection, surgery, or injury in the past few weeks
- All medicines and supplements you are currently taking, including herbal remedies and vitamins
- Any other scans you have had recently, so the team can compare images if needed
- If fasting will be difficult for you — the scan requires several hours without food beforehand
Did you know?
In people with unexplained weight loss where standard tests have found nothing, PET-CT identifies a possible cause in a meaningful proportion of cases.
A normal scan is also a useful result — it makes serious hidden disease considerably less likely, and that is information your doctor can act on.
Source: European Association of Nuclear Medicine (EANM) procedural guidelines on clinical indications for PET/CT
PET-CT at CION starts from Rs 10,499 — among the lowest published prices in Hyderabad — across 4 partner centres in Banjara Hills, Punjagutta, Himayatnagar and Narayanaguda. Indicative price, as of September 2026.
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Your next step
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Common questions
Frequently asked questions
Will the scan tell me definitively whether I have cancer?
No scan gives a definitive diagnosis on its own. A PET-CT shows areas of unusual metabolic activity, which a radiologist reports and your referring doctor interprets alongside your symptoms, blood tests, and history. An abnormal area may lead to further investigation, including a biopsy. A normal scan does not rule out every condition, but it does make serious hidden disease less likely. Your referring specialist will explain what the result means for you specifically.
Is a PET-CT safe? What about radiation?
A PET-CT involves a small amount of ionising radiation from both the CT component and the radioactive tracer. The dose is low and is considered acceptable when the clinical question justifies the scan. The tracer leaves the body within hours. If you are pregnant or breastfeeding, tell the team before the scan — specific guidance applies. Your referring doctor has weighed the benefit of the information against the radiation exposure before ordering it.
What should I eat or drink before the scan?
You will be asked to fast for several hours before the scan — usually no food after midnight if your appointment is in the morning. Plain water is allowed. Fasting keeps your blood sugar stable, which affects how the tracer distributes through the body. Strenuous exercise should be avoided for at least 24 hours beforehand for the same reason. The team will give you exact instructions when your appointment is confirmed. If fasting is difficult because of a medical condition, tell the team in advance so they can advise you.
How long will the whole appointment take?
Allow two to three hours for the full appointment. After the tracer is injected, you wait quietly for roughly an hour while it distributes — movement during this time affects image quality. The scan itself usually takes 20 to 30 minutes. You are then free to leave. The tracer has a short half-life and clears quickly; the team will advise you on any brief precautions around young children or pregnant people in the hours after.
When will I get the result, and who explains it to me?
The scan is reported by a radiologist and the report goes directly to the doctor who referred you. CION does not contact you with results. Your referring specialist will review the report alongside your other test results and explain what it means for your situation. If you have not heard from them within the timeframe they gave you, contact their clinic directly. Raw scan reports contain technical language that needs clinical context — wait for your doctor's explanation rather than trying to interpret it yourself.