Medical Oncologist
CION Cancer Clinics
Blue light and narrow band imaging TURBT | CION Cancer Clinics
Blue light cystoscopy and narrow band imaging are two ways of making bladder growths easier to see during a TURBT. Under ordinary white light, small or flat cancers can look like normal lining. Blue light makes them glow after a medicine is put in the bladder; narrow band imaging filters the light so their blood vessels stand out. This page explains how each works, who gains most, and what neither can do. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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On this page
- What are blue light and narrow band imaging in a TURBT?
- Blue light and narrow band imaging, compared
- When does enhanced imaging make the most difference?
- What is different on the day if blue light is used?
- What enhanced imaging cannot do, and who it may not suit
- Three things families tell us, and what is actually true
- Words you may see, in plain language
- Common questions about blue light and NBI
The short answer
What are blue light and narrow band imaging in a TURBT?
They are two ways of making bladder growths easier to see through the telescope. Ordinary TURBT uses white light, and small or flat cancers can look almost the same as the normal lining under it. Blue light and narrow band imaging make those areas stand out, so the surgeon is less likely to leave one behind.
Blue light, in plain terms
A medicine is put into the bladder through a catheter about an hour before the operation. Cancer cells take it up more than healthy cells do. Under a special blue light, those cells glow pink or red while the normal lining looks blue. The surgeon switches between white and blue light during the operation and removes whatever glows.
Narrow band imaging, in plain terms
No medicine is needed. The telescope filters the light to two narrow colours that are absorbed by blood. Because cancers have more small blood vessels than the normal lining, they show up darker and sharper. The surgeon presses a button to switch it on and off.
Why either is used
Bladder cancer comes back in the bladder more often than most cancers return. A share of those returns are growths that were present at the first operation but too faint to see. Enhanced imaging is one way of lowering that share.
Not every centre has either. Whether yours does, and whether it would be used in your case, is a question to ask before the admission.Side by side
Blue light and narrow band imaging, compared
Blue light cystoscopy
Narrow band imaging (NBI)
Needs a medicine put into the bladder about an hour beforehand
Needs no medicine; it is a setting on the telescope
Cancer glows pink against a blue background
Cancer looks darker and its blood vessels sharper
Strongest evidence for finding flat carcinoma in situ
Evidence is good but generally smaller and more mixed
Adds to the cost because of the medicine and the equipment
Adds little once the centre has the equipment
Inflamed or recently treated lining can glow without being cancer
Inflamed lining can also look suspicious
Not sure whether this applies to you?
Ask an oncologistWho gains most
When does enhanced imaging make the most difference?
The benefit is not the same for everyone. These are the situations where guidelines and studies point to it most clearly.
Flat cancer that is hard to see
Carcinoma in situ is a flat, high grade patch that can look like a faint red area or like nothing at all under white light. This is where blue light has the strongest evidence for finding what white light misses.
Several growths at once
When there are multiple growths, the chance of a small one being overlooked rises. Enhanced imaging helps the surgeon map all of them before starting to scrape.
Cancer that keeps coming back
If check cystoscopies keep finding new growths, it is reasonable to ask whether some were left behind rather than new. An enhanced look at the next TURBT can settle that.
Positive urine test, nothing seen
Sometimes urine tests find cancer cells but the white light cystoscopy shows nothing. Blue light or NBI is one of the tools used to find where those cells are coming from.
Less likely to change much for
- A single, obvious, low grade growth
- Cancer already known to be in the muscle
On the day
What is different on the day if blue light is used?
The medicine goes in
A small catheter is passed and the medicine is put into the bladder about an hour before the operation. You are asked to hold it rather than pass urine. Some people feel a mild urge; most feel little.
The operation begins as usual
Anaesthetic, telescope, and a first look under ordinary white light. The surgeon maps what can be seen the usual way.
The blue light is switched on
The surgeon looks again under blue light and marks any area that glows. Anything found this way is removed along with the obvious growths, and sent to the laboratory in its own pot.
Afterwards
Recovery is the same as any TURBT. The medicine leaves the body in the urine. With NBI, nothing on this list changes except that the surgeon presses a button instead of instilling a medicine.
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Being straight with you
What enhanced imaging cannot do, and who it may not suit
It cannot see below the surface. Blue light and NBI help find growths on the lining; they say nothing about how deep a growth has gone. The depth still comes from the muscle in the specimen and the pathology report, and a second TURBT is still advised for the same findings whether or not enhanced imaging was used.
It finds things that are not cancer
Inflamed lining, a recent biopsy site and a bladder that has had BCG washes can all glow or look dark. That means some areas removed under enhanced imaging turn out to be harmless on the report. It is a known trade-off: a few extra samples, in exchange for fewer missed cancers.
It does not replace a careful surgeon
The largest gains in studies came from finding flat and small growths. A thorough white light TURBT by an experienced surgeon already finds most growths, and the added benefit is measured in the ones at the margin. Enhanced imaging is a help, not a substitute for technique.
Who it may not suit, and what to ask
Blue light needs the medicine to be held in the bladder, which is difficult for someone who cannot hold urine or has a very irritable bladder. Neither method is needed for a growth already known to be in the muscle, where the plan does not depend on finding small lining lesions. Ask your centre whether they have either, whether they would use it for your findings, and what it adds to the bill.
Commonly believed
Three things families tell us, and what is actually true
"A hospital without blue light cannot do a proper TURBT."
White light TURBT is the standard operation worldwide, and most bladder cancers are found and removed with it. Enhanced imaging adds to that in particular situations. The surgeon's care in mapping the whole bladder matters more than the colour of the light.
"If it glowed under blue light, it must be cancer."
Glowing means the cells took up the medicine. Cancer does, and so does inflamed or healing lining. Only the laboratory report says which. Wait for it before reading meaning into what the surgeon saw.
"With blue light there is no need for a second TURBT."
Enhanced imaging finds more growths on the surface. It does not check depth. If the report shows high grade or T1 cancer, or no muscle in the sample, the second look is still advised for the same reasons as before.
On your report
Words you may see, in plain language
- Photodynamic diagnosis (PDD)
- The formal name for blue light cystoscopy. Same thing.
- Hexaminolevulinate
- The medicine put into the bladder before a blue light TURBT. You may see a brand name instead.
- Fluorescence-positive
- An area that glowed under blue light. It was removed and sent separately; the report says what it actually was.
- Carcinoma in situ (CIS)
- A flat, high grade cancer confined to the lining. The finding enhanced imaging is most useful for.
- False positive
- An area that glowed or looked dark but turned out not to be cancer on the report. Expected, and not a failure.
Questions we are asked
Common questions about blue light and NBI
Does CION use blue light or NBI?
Availability differs between centres and changes over time, so we would rather you ask than read a claim on a web page. Call the helpline, tell us what the cystoscopy found, and we will tell you what is available for your situation and what the surgeon would recommend.
Is the medicine for blue light safe?
It sits in the bladder for a short time and leaves in the urine. Side effects are uncommon and usually mild, such as bladder discomfort or a brief urge to pass urine. It is not given to people with known allergy to it, and it is not used when the lining is heavily inflamed because it can then mislead.
Does it make the operation longer?
A little. The surgeon looks twice, under white light and then under blue light or NBI, and may remove one or two extra areas. The medicine for blue light also has to be given an hour before, so you may be asked to arrive earlier than for a plain TURBT.
Will it cost more?
Blue light usually does, because of the medicine and the equipment. NBI adds little where the centre already has the telescope. Whether the extra is covered by Aarogyasri, CGHS, ECHS, EHS or a cashless insurer varies, so ask for it to be itemised before the admission.
Can it be used at the check cystoscopies too?
NBI can, because it is a setting on the telescope, and some clinics use it at every check. Blue light needs the medicine and an anaesthetic in most settings, so it is usually reserved for the operation itself rather than for routine clinic checks.
My mother had a plain TURBT. Was something missed?
Not necessarily. Most growths are found under white light by a careful surgeon. If her report was high grade or showed several growths, a second TURBT is often advised anyway, and that is where enhanced imaging can be discussed. Ask her team whether it would add anything in her case.
Does enhanced imaging reduce the chance of the cancer coming back?
Studies suggest fewer growths are left behind, and so fewer are found at the early check cystoscopies. Whether that changes the longer course of the disease is less certain, and the evidence is more mixed. It is an honest "helps, but is not the whole answer".
Is there any reason not to have it?
The main ones are cost, availability, and the extra areas removed that turn out harmless. For a single obvious low grade growth the gain is small. Your surgeon weighs those against what the cystoscopy showed. This page cannot tell you which way that balance falls for you.
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Dr. C. Raghavendra Reddy
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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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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Dr. Vinay Mamidala
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Sources
- Cancer Research UK — Bladder cancer: treatment
- NICE — Bladder cancer: diagnosis and management (NG2)
- American Cancer Society — Tests for bladder cancer
- National Cancer Institute — Bladder Cancer Treatment (PDQ), patient version
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
TURBT: What the Operation InvolvesThe operation the imaging is added toRe-TURBT: Why a Second Scrape Is Often NeededStill advised for the same findings, with or without enhanced imagingSurveillance Cystoscopy After TURBTWhere NBI is sometimes used at the checksTURBT Cost in HyderabadWhat enhanced imaging can add to the billChoosing a Surgeon and a CentreWhat to ask a centre before the admission
Talk to us
Wondering whether enhanced imaging would help in your case?
Tell us what the cystoscopy or scan found and we will connect you with a surgical oncologist who can say what is available and whether it would add anything for you. One helpline serves every CION centre.