Paediatric imaging
PET-CT for Children: — A Parent's Safety Guide
A PET-CT scan for your child can feel alarming to consider. In practice, when your child's oncologist has requested one, it is almost always feasible — with the dose adjusted for your child's weight and the preparation adapted for younger patients.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026
- Dose adjusted by weight — Your child receives a smaller tracer amount than an adult, calculated from their body weight on the day of the scan.
- Not the same as an adult scan — Paediatric protocols differ from adult ones in dose, preparation, and whether sedation is used.
- Sedation is not always needed — Many children from school age manage without sedation. Your team will tell you what applies to your child.
- Your oncologist decides — Whether the scan is appropriate is a clinical decision based on your child's diagnosis and what the team needs to know.
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PET-CT is used in children when the clinical benefit — usually staging or monitoring cancer — outweighs the radiation involved. The tracer dose is calculated from your child's body weight, so it is smaller than an adult dose. Most children from school age can have the scan without sedation. Your child's oncologist decides whether it is appropriate.
CION does PET-CT in Hyderabad from Rs 10,499 — among the lowest published prices in the city, with no hidden charges. Indicative price, as of September 2026.
How does a child's PET-CT differ from an adult's?
| Feature | Adult scan | Child scan |
|---|---|---|
| Tracer dose | Standard fixed amount | Calculated from body weight — smaller in smaller children |
| Sedation | Not routinely needed | May be needed for younger or anxious children |
| Who approves | Referring oncologist | Oncologist, often with paediatric input |
| Fasting | Standard instructions | Adjusted for age — ask for written instructions |
| Scan duration | Varies by protocol | Similar — staying still is the key requirement |
What should I bring and tell the team on scan day?
- Your child's current weight — the dose is calculated from it on the day
- Any allergies, including to medicines or contrast agents
- Whether your child has diabetes, takes insulin, or has blood sugar concerns
- All current medicines, including herbal and Ayurvedic preparations
- If your child is a teenager who could be pregnant — the team will need to know before the scan
- A comfort item or familiar toy if your child is anxious
- The exact fasting start time from your written instructions
What do the terms used at the scan centre mean?
- FDG (fluorodeoxyglucose)
- A small amount of a radioactive sugar injected before the scan. Cancer cells take it up more than healthy cells, which is how they appear on the images.
- Weight-adjusted dose
- The amount of FDG is calculated from your child's body weight, keeping radiation exposure in proportion to their size.
- ALARA
- As Low As Reasonably Achievable. The principle guiding radiation use in children — minimum exposure needed to get a clear, useful image.
- Sedation
- A medicine that makes your child calm or sleepy so they can stay still. Not always needed, but available when required.
- Dosimetry
- The calculation that works out the exact dose for your child's weight, so no more is given than necessary.
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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Is a PET-CT scan safe for my child?
The radiation in a PET-CT scan is real, and it is reasonable to ask about it. Paediatric guidelines from EANM and SNMMI require that the tracer dose be adjusted by body weight rather than given as a flat adult amount, specifically to keep exposure proportionate to a child's size.
The scan is requested when the information it provides is expected to guide treatment in a meaningful way. Your child's oncologist has weighed that benefit against the radiation before requesting it. Ask them to explain that reasoning — it is a fair and important question.
If your child is a teenager who could be pregnant, tell the team before the scan. A pregnancy test may be needed first, and that decision sits with the clinical team.
Did you know?
EANM and SNMMI paediatric dosing guidelines specify that FDG doses for children must be calculated by body weight using agreed reference tables — not adapted from adult protocols.
The aim is a diagnostic image at the lowest exposure that achieves it.
Source: EANM/SNMMI harmonised paediatric dosimetry guidelines
What do parents most want to know?
Will my child need sedation?
Sedation is offered when a child cannot stay still for the duration of the scan. Children from school age often manage without it; younger children more often need it. The team will assess your child individually rather than deciding by age alone. If sedation is planned, separate fasting instructions will be provided before the appointment.
What happens if my child moves during the scan?
Movement blurs the images and makes them harder to interpret. The team will spend time settling your child before starting. If your child cannot stay still despite this, the scan may be paused or rescheduled — a clear image at a second attempt is more useful than a blurred one on the first.
How long will the whole visit take?
A PET-CT visit takes several hours from arrival to leaving, because there is a waiting period after the tracer injection before the scan itself begins. The scan time is shorter, but preparation, injection, waiting, and scanning together usually mean at least a half-day commitment. Ask the centre for a specific timeline when you book.
Can I stay with my child during the scan?
You can usually be present during preparation and the tracer injection. Whether you can remain in the scan room depends on the centre's policy, because the room carries a small radiation exposure. If you are or could be pregnant, you should not enter the scan room. Ask the centre directly when you book so your child knows what to expect.
My child has sensory sensitivities or autism. Can they still have the scan?
Yes, in most cases, with preparation. Tell the team about your child's specific needs when you book — not on the day. Options include a pre-visit familiarisation, adjusted room environment, flexible timing, and sedation if needed. The earlier the team knows, the more they can plan.
Is there a minimum age for PET-CT in children?
There is no fixed minimum age. The decision is clinical — whether the scan's benefit justifies the exposure for your child at their current stage. Paediatric protocols exist for very young children when a scan is considered clinically necessary. That decision belongs to your child's oncologist and the paediatric team at the scan centre.
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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- PET-CT for Very Heavy Patients: Weight and Bore Limits
- PET-CT for Wheelchair and Bedbound Patients
- PET-CT in Pregnancy: Why It Is Avoided
- Sedation and Fasting for a Child's PET Scan
Contrast, Cannula & Procedure Safety
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- Can You Have a PET-CT Through a Port or PICC Line?
- Contrast Allergy and PET-CT: What to Declare
- Contrast Reaction Symptoms: What to Watch For
- Contrast and Kidney Function: The Creatinine Rule
- Infection Risk and Hygiene at a Scan Centre
- Is Contrast Used in a PET-CT Scan?
- Metformin and Contrast: What Is the Rule?
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- The Cannula: Bruising, Pain and Difficult Veins
- Tracer Leakage at the Injection Site (Extravasation)
- What If You Feel Unwell During the Scan?
Diabetes & Blood Sugar for PET-CT
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- Best Appointment Time for a Diabetic PET Scan
- Can Diabetics Take Their Tablets Before a PET Scan?
- Does Diabetes Change Your SUV Reading?
- Fasting Safely With Diabetes Before a Scan
- Insulin and PET-CT: Timing Rules
- Newly Diagnosed Diabetes Found Before a Scan
- PET-CT Scan With Diabetes: The Complete Preparation Guide
- PET-CT With Steroid-Induced High Sugars
- What Blood Sugar Level Is Needed for a PET-CT Scan?
- What Happens If Your Sugar Is High on the Day?
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Preparing for Your Scan
- A Printable PET-CT Preparation Card
- Can I Drink Water Before a PET-CT Scan?
- Can I Have a PET-CT Scan During My Period?
- Can I Take My Regular Medicines Before a PET-CT Scan?
- Can You Reschedule a PET-CT Scan?
- Cold Weather, Shivering and Brown Fat: Why You Are Asked to Stay Warm
- Fasting Before a PET-CT Scan: How Long and Why
- How to Prepare for a PET-CT Scan: The Complete Checklist
- Preparing a Very Elderly or Frail Person for a PET-CT
- Preparing a Wheelchair-Bound or Bedridden Patient
- Preparing for a PSMA, DOTATATE or FAPI PET-CT
- Should I Avoid Exercise Before a PET-CT Scan?
- Smoking, Alcohol and Caffeine Before a PET-CT Scan
- What Happens If You Break the Fast by Mistake?
- What to Carry to Your PET-CT Appointment
- What to Eat the Day Before a PET-CT Scan
- What to Wear to a PET-CT Scan
- Why Your Kidney Function Test Is Needed Before a PET-CT
Radiation Safety & After-Scan Precautions
- Are You Radioactive After a PET-CT Scan?
- Being Around Pregnant Women After a PET-CT Scan
- Can I Hold My Child or Grandchild After a PET-CT Scan?
- Can a PET-CT Scan Cause Cancer?
- Cumulative Radiation From Repeated Scans
- Do You Need Precautions After a PSMA or DOTATATE Scan?
- Do You Need Separate Utensils or a Separate Toilet After a PET-CT?
- How Long Does the Tracer Stay in Your Body?
- How Long Should You Avoid Close Contact After a PET-CT?
- How Many PET-CT Scans Are Safe in a Year?
- How Much Radiation Is in a PET-CT Scan?
- Is PET-CT Radiation Different From Radiotherapy?
- Is the Radiation From a PET-CT Scan Dangerous?
- PET-CT Radiation Compared With CT, X-Ray and Natural Background
- Radiation Safety at Home After Your Scan: A Family Checklist
- Radiation Safety for Staff and Attendants at the Centre
- Simple Steps to Clear the Tracer Faster
- Travelling Home After a PET-CT Scan: Public Transport and Airports
Scan Day: What Actually Happens
- Can Someone Stay With Me During the Scan?
- Can You Drive Yourself Home After a PET-CT Scan?
- Can You Have Sedation for a PET-CT Scan?
- Can a PET-CT Scan Be Done on the Same Day as Other Tests?
- Contrast in a PET-CT Scan: When It Is Used and Why
- Eating and Drinking After Your PET-CT Scan
- How Long Does a PET-CT Scan Take?
- Is a PET-CT Scan Painful?
- Is a PET-CT Scanner Closed Like an MRI? Claustrophobia Explained
- The Tracer Injection: Does It Hurt?
- What Happens If the Scan Cannot Be Completed?
- What If You Cannot Lie Still or Have Tremors?
- What to Expect Immediately After the Scan
- Why Was My Scan Repeated or Extended on the Day?
- Why You Have to Wait an Hour After the Injection
- Your PET-CT Scan Day: What Happens, Step by Step
Your next step
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Common questions
Frequently asked questions
How much radiation does my child actually receive?
The amount depends on your child's weight — the dose is calculated individually, not taken from a fixed adult figure. We cannot give you a precise number here because the scan centre's dosimetry team calculates it specifically for your child. EANM and SNMMI guidelines are clear that it should be the minimum needed to produce a usable image. Ask the scan centre to explain your child's specific calculated dose before the scan takes place.
Is the radiation from a PET-CT more than a CT scan alone?
Yes. A PET-CT combines radiation from two sources — the FDG tracer and the CT — which is higher in total than CT alone. Paediatric protocols keep that exposure as low as possible through weight-adjusted dosing. Your child's oncologist requested the combined scan because CT alone cannot provide the same clinical information. If you want to understand that reasoning, put it directly to them.
How should I explain the scan to my child?
Keep it simple and honest. Tell your child they will have an injection, wait quietly while a medicine goes through their body, then lie still in a machine that takes pictures inside. Reassure them it does not hurt beyond the injection. For younger children, a camera comparison helps. Avoid promising it will be easy — saying 'you can do this' is more useful than 'it will be fine'.
What if my child is too frightened to go through with the scan?
Tell the team before the day if your child is very anxious — options such as a pre-visit familiarisation and sedation require advance notice to arrange. A visit to see the room and meet the team before the actual appointment reduces fear significantly in children frightened of the unknown. If the scan cannot proceed on the day, the oncologist will discuss what alternatives exist for getting the information they need.
Are there children who cannot have a PET-CT?
A teenager who is pregnant cannot have the scan. Children with poorly controlled blood sugar may need their diabetes managed first, because FDG uptake depends on blood sugar being within an acceptable range. Your child's oncologist and the scan centre will ask about these factors before confirming the booking. Tell the team straight away if your child's health changes after the appointment is made.
When will we get the results?
Results are not given on the day. A specialist reviews the images and sends a written report to your child's oncologist. Ask the scan centre how long the report typically takes, and ask the oncologist when to expect a discussion of the findings. The appointment after the scan is where results are explained in the context of your child's treatment plan — not through a message that leaves you without context.