PET-CT and Diabetes
When to Book a PET Scan — If You Have Diabetes
For people with diabetes, when you book your PET scan matters as much as how you prepare. An early morning appointment reduces the time you go without food, which makes blood sugar easier to manage and the scan more likely to go ahead first time.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- Morning slots reduce risk — A shorter fast means your blood sugar is easier to manage on the day of the scan.
- High sugar on arrival means rescheduling — If your blood sugar is above the centre's limit when you arrive, the scan cannot go ahead. A morning slot reduces that risk.
- One request at booking makes the difference — Asking for an early slot is a simple request that most imaging centres can accommodate when given a medical reason.
- Medication timing must be agreed in advance — Confirm what to do with your diabetes medication with your treating doctor before the scan date, not on the morning itself.
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An early morning appointment is the right choice for people with diabetes having a PET scan. A shorter fast means blood sugar is easier to keep in range, and the scan is more likely to go ahead on the day. Request the first available slot when you book, and confirm your medication timing with your treating doctor beforehand.
CION offers 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 do you arrange an early morning PET scan slot?
Get your referral with diabetes noted
Ask your oncologist for a PET-CT referral and confirm that your diabetes is recorded on the request. This gives the imaging centre the context it needs when scheduling.
Call the imaging centre and ask for the earliest slot
When you book, ask specifically for the first available morning appointment. Mention that you have diabetes — this is a recognised medical reason for requesting an early slot.
Confirm your medication plan before the scan date
Speak to your treating doctor about what to do with your diabetes medication on the morning of the scan. Sort this out in advance, not on the day.
Call the day before to reconfirm
Check your arrival time and fasting instructions again the day before. If your blood sugar is a concern on the morning of the scan, you will already have the centre's number ready.
Arrive as directed
Come fasted as instructed and bring your diabetes medications as your doctor has advised.
What should you tell the imaging centre when you book?
- That you have diabetesSay this at the start of the booking call so it is recorded on your file.
- Whether you take medication to manage your blood sugarYou do not need to give exact doses — confirm that you take medication so the centre can give you the right instructions.
- Ask what blood sugar level would stop the scan going aheadEvery centre has a specific limit. Knowing it in advance means you can plan with your doctor and avoid a wasted journey.
- Ask for fasting instructions specific to your diabetesThe standard fasting instruction given to other patients may not apply to you. Ask for one that fits your situation.
- Ask for the centre's contact number for the morning of the scanIf your blood sugar reading is a concern before you leave home, you need a number to call rather than guessing whether to travel.
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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Does the time of day affect whether the scan goes ahead?
| Factor | Morning appointment | Afternoon appointment |
|---|---|---|
| Time without food | Overnight fast only — shorter period | Overnight fast continues into the day — longer period |
| Blood sugar stability | Easier to keep in range over a shorter fast | More likely to drift out of range the longer you go without food |
| Scan proceeds on the day | More likely if your reading is in range on arrival | Higher chance of an elevated reading that requires rescheduling |
| Medication plan with your doctor | Simpler — covers the morning only | More complex — covers a full day without food |
What happens if your blood sugar is too high on the day?
If your blood sugar is above the level the imaging centre has set when you arrive, the scan cannot go ahead that day.
PET-CT slots are limited. A reschedule usually means a wait of several weeks — and the cost of travel and a day taken off work is lost.
An early morning appointment, with a medication plan agreed with your doctor in advance, gives the scan the highest chance of going ahead first time.
If your morning reading is a concern, call the centre before you travel. That one call can save you the journey.
Book a PET-CT at CION from Rs 10,499 — among the lowest published prices in Hyderabad — with an oncologist-reviewed report and a free Rs 950 consultation, across 4 partner centres. Indicative price, as of September 2026.
Explore 92 more Preparing For and Having Your Scan Safely topics
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Preparing for Your Scan
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- 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
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- Should I Avoid Exercise Before a PET-CT Scan?
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- What Happens If You Break the Fast by Mistake?
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- 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?
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- 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?
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- Is PET-CT Radiation Different From Radiotherapy?
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- Radiation Safety at Home After Your Scan: A Family Checklist
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- 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
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- What Happens If the Scan Cannot Be Completed?
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- What to Expect Immediately After the Scan
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- PET-CT for Patients With a Stoma
- PET-CT for Patients on Long-Term Steroids
- PET-CT for Very Elderly or Frail Patients
- 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
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Common questions
Frequently asked questions
What if there are no morning slots available?
Ask to go on a cancellation list for the earliest possible time. If morning availability is consistently limited, ask your oncologist to note your diabetes clearly on the referral — this gives the centre a medical reason to prioritise an early slot. It is also worth calling again a week or two before your preferred date, as cancellations do come up and early slots are often the first to be released.
Can I have anything to eat or drink before a morning PET scan?
The fasting instructions for someone with diabetes are not always the same as those given to other patients. Do not assume the standard instruction applies to you. Ask the imaging centre specifically what you should and should not have before your scan, given that you have diabetes. Your treating doctor can confirm this before the appointment.
What do I do with my diabetes medication on the morning of the scan?
Confirm this with your treating doctor before the scan date — not on the morning itself. The right approach depends on your specific treatment and the fasting period involved. There is no single instruction that applies to everyone with diabetes. If your appointment is confirmed at short notice, call your doctor's clinic for guidance as soon as you know the date.
What blood sugar level is too high for a PET scan?
Each imaging centre sets its own acceptable range, and the number is not universal. Ask for it when you book so you know what your morning reading needs to be. If your reading on the day is close to or above that level, call the centre before you travel — they will tell you whether to come in or whether it is safer to rebook.
How does CION coordinate my PET-CT booking?
PET-CT scans for CION patients are done at partner imaging centres. When the centre contacts you to confirm your appointment, ask for an early morning slot and raise your diabetes at that point if it has not already been noted. If you have not received clear fasting and medication instructions before your scan date, call the imaging centre directly — do not wait and assume the information will arrive.