Medical Oncologist
CION Cancer Clinics
What the endoscopist can tell you on the day of your colonoscopy | CION Cancer Clinics
Often the endoscopist can tell you on the day that a growth looks suspicious. They cannot confirm that it is cancer. That needs the biopsy, read under a microscope by a pathologist, which takes several days. This page explains what can honestly be said before you leave the room, what has to wait for the laboratory and the scans, and how to use the days in between. At CION Cancer Clinics, our team goes through your reports with you and plans the next test or treatment step.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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The short answer
Can a colonoscopy tell you it is cancer on the same day?
It can often tell you that something looks worrying. It cannot confirm cancer. The endoscopist, the doctor who guides the camera through the bowel, can usually recognise a growth that looks like a cancer, and many will say so plainly before you go home. What you get on the day is an impression. The confirmation comes from the biopsy, a few small pieces of tissue taken during the same test.
Why the camera is not the final word
A colonoscopy shows the inner lining of the colon in colour and close up. It shows the shape, size and position of anything abnormal. It cannot show what the cells inside that growth are doing. Some large, angry-looking polyps, small growths on the lining, turn out to be harmless under the microscope. Some small, flat patches turn out to be early cancers. Only a pathologist reading the tissue can settle it.
Why some doctors say more than others
Some endoscopists describe what they saw and prefer to wait for the biopsy. Others tell you directly that it looks like a cancer, so the family can start planning. Both approaches are reasonable. If you were drowsy from sedation and do not remember the conversation, ask for it again with a relative beside you.
"Looks suspicious" is a reason to move quickly. It is not yet a diagnosis.Before you leave
What can the endoscopist tell you on the day?
Most findings fall into one of four groups. Each one leads to a different next step.
A normal-looking bowel
The camera reached the start of the colon and saw nothing abnormal. If you had symptoms, the doctor will say whether anything else needs checking, because some causes of bleeding or anaemia, a low haemoglobin, sit outside the colon.
Polyps that were removed
Small growths were taken out during the test and sent to the laboratory. Most polyps are not cancer, and removing them is one way cancer is prevented. The report will say what kind they were and when you need your next colonoscopy.
A growth that looks suspicious
A mass, an ulcer or a narrowing that looks like a cancer. The endoscopist takes several biopsies and often marks the spot with a small ink tattoo so a surgeon can find it later.
What they can usually describe
- Where in the colon it sits
- Roughly how large it looks
- Whether it narrows the bowel
- Whether the camera could pass beyond it
Something that is not cancer
Diverticular disease, colitis, piles or a small tear near the anus can explain many symptoms, and the endoscopist can often name these on the day. Piles are common in Indian adults and do not rule out a problem higher up, which is why the whole colon is checked.
Not sure whether this applies to you?
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What is known on the day, and what has to wait?
Known on the day
Waits for the biopsy or the scans
Whether something abnormal is there
Whether it is cancer
Where it sits in the colon
What type of tumour it is
Its rough size and shape
How abnormal the cells look, called the grade
Whether polyps were taken out
Whether they were removed completely
Whether the bowel is narrowed
Whether anything has spread, which needs a CT scan
The days in between
What usually happens after a suspicious finding?
The biopsies go to the laboratory
The tissue is processed, cut very thin and stained before a pathologist reads it. This takes several days, longer if extra stains are needed. Why the biopsy is still needed is explained on its own page.
A CT scan may be booked early
Many doctors arrange a CT scan of the chest, abdomen and pelvis before the biopsy is back, so no time is lost. It looks for spread to the liver, lungs and lymph nodes, the small glands that filter fluid.
Blood tests are taken
A blood count checks for anaemia. A CEA blood test gives a starting value to compare against later. CEA cannot diagnose or rule out cancer on its own.
The tumour board meets
Once the biopsy and scans are in, the case goes to a tumour board, where oncologists, surgeons and radiologists agree a plan together. At CION, this is where the treatment plan is set.
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Did you know
The ink tattoo placed beside a suspicious growth is harmless and lasts for years. It lets a surgeon find the exact spot from the outside of the bowel during keyhole surgery, where a small tumour often cannot be felt. If you were tattooed, keep the report that says so.
Being straight with you
What this page cannot tell you
It cannot tell you what your endoscopist saw, or what your biopsy will show. A doctor who has looked at your photographs and report can. If you were told something looked suspicious, the most useful thing you can do now is make sure the biopsy result and the scan are being chased, and that a specialist will see you once both are back.
Who this does not apply to
If the growth was found low down, in the rectum, the pathway is different. Rectal cancer usually needs an MRI of the pelvis before treatment is decided, and it has its own pages under rectal cancer. If the problem sits at the anal opening, see the anal cancer pages. If your test was a routine screening colonoscopy and only small polyps were removed, most of this page does not apply to you.
Where CION fits
CION does not perform colonoscopy itself. CION arranges the colonoscopy and biopsy at accredited partner hospitals and diagnostic centres, and its oncologists go through the findings with you. If you already have a report, bring it along with the photographs printed during the procedure.
If you are waiting on a biopsy and nobody has told you who will call, ring the helpline. Someone will help you find out where the result is.Questions we are asked
Common questions about colonoscopy results on the day
Can the doctor tell if it is cancer just by looking?
Often they can tell it looks like a cancer, and an experienced endoscopist is usually right. But the eye can be wrong in both directions. A confirmed diagnosis comes only from the biopsy, read by a pathologist under a microscope. Treatment is not started on appearance alone.
How long does the biopsy result take?
Usually several days, and sometimes longer when the pathologist needs special stains or extra tests on the tumour. Times differ between laboratories. Before you leave, ask who will receive the result, how you will be told, and whom to call if you hear nothing.
Should we wait for the biopsy before doing anything?
No. Use the waiting time. Ask whether the CT scan and blood tests can be booked now, collect copies of the report and photographs, and arrange to see an oncologist. With these ready, the treatment discussion can happen as soon as the biopsy result is in.
Why did nobody tell me anything after the test?
You may have been drowsy from sedation and forgotten the conversation, or the endoscopist may have chosen to wait for the biopsy. Ask for the written report, which describes what was seen. You can ask for a copy and for someone to explain it in plain words.
My colonoscopy was normal. Can I still have cancer?
A complete colonoscopy with a well-cleaned bowel is a very reliable test of the colon. It is not perfect, and small flat patches are occasionally missed. If your symptoms continue or new ones appear, go back to your doctor rather than treating one normal result as the final word.
What does it mean if the camera could not get past the growth?
It usually means the growth narrows the bowel. The colon beyond it has not been seen, so another test such as CT colonography may be needed. A narrowing can also block the bowel, so vomiting, a swollen belly or no stool or wind needs the emergency department the same day.
Will the polyps removed today need more treatment?
Most removed polyps need nothing more than a follow-up colonoscopy when your doctor advises. Occasionally the laboratory finds early cancer inside a polyp, and the team then decides whether removal was enough or surgery is needed. The polyp report tells you which.
Can CION see me before the biopsy is back?
Yes. Book a consultation and bring your colonoscopy report, photographs and any scans. The oncologist can explain what was seen, check that the right tests have been ordered and plan what happens once the biopsy result is in. Call the CION helpline to arrange it.
Your Specialists
Meet CION's colon cancer specialists. Bring your colonoscopy, scan or biopsy report.
Our surgical and medical oncologists plan colon cancer care together: which operation, whether chemotherapy is needed, and the follow-up that comes after.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- NHS — Colonoscopy
- NIDDK (NIH) — Colonoscopy
- NHS — Tests and next steps for bowel cancer
- Cancer Research UK — Diagnosing bowel cancer
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
Why a biopsy is still needed after colonoscopyWhat the tissue tells that the camera cannotColonoscopy for diagnosis: what to expectThe test itself, from preparation to recoveryThe diagnostic pathway step by stepWhere the colonoscopy sits among all the testsHow long does diagnosis take?A realistic picture of the wait, start to finish
Talk to us
Told something looked suspicious and waiting for the biopsy?
Bring your colonoscopy report and photographs, and a CION oncologist will explain what was seen and what should happen next. We can also check that the right scans and blood tests are already booked. One helpline serves every CION centre.