Preparing for your scan
Why Your Kidney Function Test — Is Needed Before a PET-CT
The creatinine test feels like an extra hurdle before an already stressful scan. It is not. It tells the imaging team whether your kidneys can safely clear the contrast dye used in the scan — and without that information, giving you the dye could cause kidney damage.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026
- Not a formality — The test protects your kidneys from a real risk that contrast dye carries when kidney function is reduced.
- Usually one blood draw — A small blood sample is enough. Results are typically back the same day or the following morning.
- A high result does not cancel your scan — It changes the plan. Your team will discuss the options before anything is given.
- You do not need to interpret the number — The imaging centre reviews the result and tells you whether to proceed as booked.
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The creatinine test checks whether your kidneys are working well enough to clear the contrast dye used in the CT part of your PET-CT scan. Kidneys that are not working at full capacity can be damaged by the dye. The test gives your imaging team the information they need to keep you safe.
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.
What are the steps from booking my PET-CT to having the scan?
The centre tells you at booking
When you book your PET-CT, the centre asks whether a recent creatinine result is already on file. If it is not, they tell you when and where to have the blood draw done before your scan date.
You have a blood draw
A small blood sample is taken. The laboratory measures creatinine, a waste product your kidneys filter from the blood. The result is usually ready within a few hours or by the following morning.
The imaging team reviews the result
Your creatinine level is checked against the range the imaging centre considers safe for contrast. You do not need to interpret the number yourself — the team does this and contacts you if anything needs to change.
Your scan goes ahead, or the plan is adjusted
If the result is within the acceptable range, your scan proceeds as booked. If it is not, your oncologist and the imaging team discuss what to do before any contrast is given.
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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What happens if my creatinine result comes back high?
A raised creatinine does not automatically cancel your scan. It means your team needs to understand why it is raised and what the safest path forward is.
In some cases the scan goes ahead without contrast — the CT portion is done without dye. This gives less detail on certain structures but is still clinically useful, and your oncologist and radiologist decide together whether that trade-off is right for your situation.
In other cases the scan is rescheduled to allow your kidneys time to recover, or to investigate the cause of the raised result. If you are taking anything that can affect kidney function — including herbal preparations and supplements — tell your treating team before the scan, not on the day.
Pre-existing kidney disease and diabetes both increase the risk that contrast will affect kidney function. If either applies to you, tell your booking team when you schedule the scan so there is time to plan safely.
Did you know?
Contrast-induced kidney injury is recognised in radiology guidelines as largely preventable. The American College of Radiology and the European Society of Urogenital Radiology both identify pre-scan kidney function testing as the key step that allows teams to identify who is at risk before dye is given.
The test exists because prevention is straightforward. The damage, when it occurs, is not.
Source: ACR Manual on Contrast Media; ESUR Guidelines on Contrast Agents
A whole-body PET-CT at CION is Rs 10,499 — among the lowest published prices in Hyderabad — with a free Rs 950 oncologist consultation to talk through your report. Indicative price, as of September 2026.
Explore 92 more Preparing For and Having Your Scan Safely topics
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
Contrast, Cannula & Procedure Safety
- Can You Have a PET-CT If You Are on Blood Thinners?
- 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?
- Side Effects of a PET-CT Scan
- 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
- A Diabetic Patient's PET-CT Day Plan
- 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?
- What to Eat the Day Before if You Have Diabetes
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
Special Populations
- Breastfeeding and PET-CT: How Long to Pause
- PET-CT Scans for Children: A Parent's Guide
- PET-CT With Kidney Disease or on Dialysis
- PET-CT With a Pacemaker, Stent or Metal Implant
- PET-CT for Claustrophobic Patients
- PET-CT for Patients Who Cannot Lie Flat
- PET-CT for Patients With Anxiety or Panic Disorder
- PET-CT for Patients With Dementia or Confusion
- PET-CT for Patients With Incontinence or a Catheter
- 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
- Sedation and Fasting for a Child's PET Scan
Your next step
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Common questions
Frequently asked questions
Why does a PET-CT scan use contrast dye at all?
The CT part of a PET-CT uses contrast dye to make blood vessels, organ outlines and some soft tissue structures more visible to the radiologist. It adds detail that a scan without dye can miss. Not every PET-CT uses contrast — whether yours does depends on what the scan is looking at and what your oncologist has requested. Your booking team will confirm this when you schedule.
How recent does the creatinine test need to be?
Recent enough to reflect how your kidneys are working now, not months ago. The exact timeframe is set by the imaging centre at booking and varies depending on your situation — it is typically shorter for anyone whose kidney function has been changing or who is on a treatment known to affect the kidneys. Ask the centre when you book so you know how far ahead the blood draw can be done.
My creatinine was normal last year — do I need to redo it?
Yes, in most cases. Kidney function can change because of new medication, a new treatment, or a condition that was not present before. A result from a year ago does not tell the imaging team about your kidneys today. If you already have a recent result from your oncology team, the imaging centre may accept it — check when you book rather than assuming either way.
Can I eat and drink before the creatinine blood test?
The creatinine test itself does not require fasting — you can usually eat and drink normally before the blood draw. Your PET-CT scan does require fasting, and the two are sometimes scheduled close together. Follow the specific instructions your booking centre gives you for the timing of both. If the instructions seem to conflict, call the centre and ask before you arrive.
I already have kidney disease. Can I still have the scan?
Possibly, yes — pre-existing kidney disease does not automatically rule out a contrast scan. It does mean the decision needs to be made in advance, with your current kidney function reviewed by your treating team, rather than on the morning of the scan. Tell your oncologist and your booking team when you schedule, not when you arrive. That gives everyone the time to plan safely.