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CION Cancer Clinics
Stool DNA testing: what it finds and whether it suits you in India | CION Cancer Clinics
A stool DNA test is a home screening test for colon cancer. It checks one stool sample for hidden blood and for altered DNA shed by polyps and cancers, and a positive result means you need a colonoscopy, not that you have cancer. In India it is hard to find and dearer than a FIT test. This page explains how it works, who it suits and who should skip it. At CION Cancer Clinics, our specialists help you judge which bowel symptoms need tests and plan screening that fits your risk.
NG
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
What is a stool DNA test, and does it find colon cancer?
A stool DNA test is a screening test, not a diagnosis. It looks in a stool sample for two things at once: tiny traces of blood, and altered DNA that polyps and cancers shed into the bowel. A positive result means you need a colonoscopy. It does not mean you have cancer.
How it differs from the ordinary stool test
The common FIT test looks only for hidden blood. A stool DNA test combines that blood check with a search for DNA changes, which lets it pick up some growths that are not bleeding on the day the sample was taken. The trade-off is that it is dearer, it is not easy to get in India, and it raises more false alarms than FIT does.
Where it sits in India today
The most widely known stool DNA test was designed and approved in the United States. In Hyderabad it is available only through a few private laboratories, usually as a send-away kit, and no Indian guideline asks for it. For most people here the practical choice is still between a FIT test and a screening colonoscopy. This page helps you decide whether the DNA test is worth asking about at all.
Whatever the result says, a screening test never replaces a doctor's visit if you already have symptoms.Inside the kit
What does the laboratory actually look for?
Three things are measured from one whole-stool sample. The result comes back as one combined answer, positive or negative.
Hidden blood
Polyps and cancers bleed a little, on and off. The kit measures human blood protein in the stool the same way a FIT test does. Bleeding piles or a fissure can set this part off too, which is one reason positives are often not cancer.
Altered DNA
Cells from the bowel lining are shed into stool every day. Cancer cells and some advanced polyps carry DNA changes and chemical tags that the laboratory can detect. Finding them raises the chance that a growth is present, but it cannot say where or what kind.
Typical changes checked
- Methylation marks on certain genes
- In some kits, a KRAS change, a common colon cancer fault
- A measure that enough human DNA was in the sample
A combined score
The blood and DNA readings are fed into one formula. You are told positive or negative, not which part triggered it. A negative result is reassuring for now. It does not rule out a small polyp, and it does not rule out cancer in someone who has symptoms.
If you have bleeding, a change in bowel habit or unexplained anaemia, skip screening and ask for a colonoscopy.Not sure whether this applies to you?
Ask an oncologistStart to finish
How is a stool DNA test done?
Getting the kit
A doctor or a laboratory orders it. The kit arrives by courier with a collection bucket that fits under the toilet seat, a preserving liquid and a return box. No bowel preparation, no fasting, no change to your usual food or medicines.
Collecting the sample
You pass one whole bowel motion into the bucket, add the preserving liquid, seal it and use a small probe to fill a tube from the surface for the blood check. The kit must go back quickly, because DNA breaks down in heat. In a Hyderabad summer that matters.
The laboratory
The sample is sent away, often outside the city, so the wait is longer than for a FIT test. The report arrives as positive or negative with no further detail.
If it is negative
You repeat the test after a few years if you stay well. Any new symptom in between needs a doctor regardless of the last result.
If it is positive
The next step is a colonoscopy, which CION arranges at a partner endoscopy unit. Most positive results turn out to be a polyp, something benign, or nothing at all. Do not repeat the stool test instead of having the colonoscopy.
Side by side
Stool DNA test or FIT: which should you choose?
Stool DNA test
FIT test
Looks for blood and altered DNA
Looks for hidden blood only
Repeated every few years if negative
Repeated every year if negative
More false alarms, so more colonoscopies that find nothing
Fewer false alarms, but misses more non-bleeding polyps per round
Send-away kit, few Indian labs, cost quoted separately
Available in most city laboratories at low cost
A whole stool motion is needed
A tiny smear on a stick is enough
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Commonly believed
Four things people assume about the DNA test
"It is a DNA test, so it is as good as a colonoscopy."
It is not. A colonoscopy sees the whole bowel lining and removes polyps on the spot. The stool test only guesses that something may be there. Every positive stool DNA result still ends in a colonoscopy.
"A positive result means I have cancer."
Most positive results are not cancer. They come from polyps, from piles, from bleeding elsewhere in the gut, or from the test simply misfiring. The result tells you to look, not what you will find.
"A negative result means I can forget about my symptoms."
A screening test is built for people who feel well. If you have blood in the stool, a change in bowel habit or a low haemoglobin, a negative stool test does not settle it. Those symptoms need a colonoscopy whatever the kit says.
"This test checks whether colon cancer runs in my family."
No. It looks for DNA shed by a growth in the bowel today, not for an inherited fault you were born with. That is a blood test arranged through a genetic counsellor, and it answers a different question.
Being straight with you
What this page cannot tell you
It cannot tell you whether a stool DNA test is the right choice for you, because that depends on your age, your family history, what you can get hold of locally and what you can afford. A doctor who knows those things can settle it in one short conversation.
Who this test does not suit
It is not meant for anyone with symptoms, anyone with a parent or sibling who had colon cancer at a young age, anyone with ulcerative colitis or Crohn's disease, or anyone with a known inherited syndrome such as Lynch syndrome. Those people need a colonoscopy on a set schedule, as explained on our average-risk versus high-risk page, and a stool test would only delay it.
What the result cannot say
A positive report cannot say whether the growth is a polyp or a cancer, where in the bowel it sits, or what stage anything is. Only a colonoscopy with a biopsy, read by a pathologist, can do that. A negative report cannot promise the bowel is clear; it only says nothing was detected in that sample on that day.
If you are unsure whether you count as average risk, call the CION helpline and describe your family history. Someone will tell you honestly which test fits.Questions we are asked
Common questions about stool DNA testing
Is the stool DNA test available in Hyderabad?
Only in a limited way. A few private laboratories offer a send-away kit, and the sample often travels out of the city or the country. It is not part of any public screening programme in India. Ask the laboratory where the sample is tested and how long the report takes before you pay.
How much does it cost?
It is quoted separately by each laboratory and is many times dearer than a FIT test, because the DNA work is done in a specialised centre. Health insurance rarely pays for screening tests in India. Our screening cost page compares the options in rupees.
Does it need bowel preparation or fasting?
No. You eat and take your medicines as usual and collect one ordinary bowel motion at home. The kit must be sealed and returned promptly, because heat breaks down the DNA and the laboratory may reject a sample that arrives late.
Can piles give a false positive?
Yes. Bleeding piles, an anal fissure or a stomach ulcer can all put blood into the stool and trigger the blood part of the test. That is one reason a positive result leads to a colonoscopy rather than to a diagnosis. Do not assume piles explain it, and do not assume cancer either.
I had a positive result. Can I repeat the test instead of a colonoscopy?
No. Repeating the kit only delays finding out. The right next step is a colonoscopy, which can see and remove a polyp in the same sitting. CION arranges this through a partner endoscopy unit. Our positive result page explains what happens next.
How does it compare with a blood screening test?
Blood-based screening tests are newer and so far pick up fewer early polyps than stool tests do. Both are options only for people without symptoms, and both lead to a colonoscopy when positive. Neither is part of Indian practice yet.
Can a stool DNA test find rectal cancer too?
It samples the whole bowel's output, so it can pick up blood or DNA from a rectal growth as well. Rectal cancer is treated differently and has its own hub at rectal cancer. The screening path is the same: a positive result leads to a colonoscopy.
Should I just have a colonoscopy instead?
For many people in Hyderabad that is the simpler route, because it is widely available, it removes polyps on the day, and if clear it does not need repeating for several years. If you would rather avoid the preparation and the sedation, a yearly FIT test is the realistic alternative. Talk it through with a doctor.
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.
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Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
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Dr. Bharati Devi Gorantla
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)
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Sources
- American Cancer Society — Colorectal Cancer Screening Tests
- National Cancer Institute — Screening Tests to Detect Colorectal Cancer and Polyps
- US Preventive Services Task Force — Recommendation: Colorectal Cancer: Screening
- American Cancer Society — Colorectal Cancer Guideline
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
Screening options comparedEvery screening test side by side, so you can pick oneFIT (faecal immunochemical test) explainedThe cheaper, easier stool test most people in India will be offeredBlood-based screening tests for colon cancerThe other newer option, and why it is not yet the first choiceAverage-risk vs high-risk screening pathwaysCheck whether a stool test is right for you at all
Talk to us
Not sure which screening test suits you?
Tell us your age, your family history and any symptoms, and a CION doctor will help you choose between FIT, colonoscopy and the DNA test. If a colonoscopy is needed, we will arrange it. One helpline serves every CION centre.