Living Well · Patient Guide
The Free Bowel Cancer Test Posted to Your Door — and Widely Ignored
It arrives in the post, costs nothing, takes minutes, and detects bowel cancer early. And a large share of the people who receive it never send it back.
If you designed a cancer test to be as easy as possible — free, delivered to the door, done at home in minutes, no clinic, no needle — you'd design the NHS bowel screening FIT kit. And yet a substantial proportion of people who receive one never complete it, often through squeamishness or a vague intention to 'do it later'. Since bowel cancer is highly treatable when caught early and this is the single easiest thing you can do to catch it, that gap is worth closing — starting with understanding what the test actually is.
What the FIT kit is and why it matters
The faecal immunochemical test (FIT) detects tiny, invisible traces of blood in a single stool sample — blood that can be an early sign of bowel cancer or of polyps that could become cancer. In England it's posted routinely to everyone from age 50 to 74, every two years. The reason it matters so much is the survival curve: bowel cancer caught at its earliest stage is very often curable, while late-stage disease is far harder to treat — and early disease is usually completely symptomless, which is exactly why a screening test that finds hidden blood is so valuable. The kit itself involves one small sample on a stick, sealed and posted back. That's the entire ask.
Its limits — and where symptoms override it
FIT is powerful but not infallible. A normal result makes bowel cancer much less likely at that moment but doesn't guarantee its absence, because some lesions bleed intermittently or not at all. This is the crucial caveat: screening is for people without symptoms, and a normal FIT never overrides active symptoms. Bleeding, a persistent change in bowel habit, weight loss or anaemia need assessment in their own right, whatever your last screening result said. Used properly — complete every kit, and act on symptoms separately — FIT is one of the most effective early-detection tools available to you. The worst thing you can do with it is leave it in the drawer.
Get assessed separately — screening isn't enough — if…
- You have symptoms now: bleeding, changed habit, weight loss or anaemia
- Your FIT was positive — this always needs a colonoscopy to find the source
- You're under 50 with symptoms and therefore not yet in the screening programme
- You have a strong family history that may warrant more than routine screening
- You've had symptoms since your last normal kit — the kit doesn't cover new symptoms
Frequently asked questions
Who gets sent the NHS FIT kit?
In England, everyone aged 50 to 74 is sent one automatically every two years, by post, to complete at home.
Why should I bother if I feel fine?
Because early bowel cancer is usually symptomless — feeling fine is exactly the state screening is designed for, and early detection dramatically improves outcomes.
What happens if my FIT is positive?
You'll be offered a colonoscopy to find the source of the blood — most positives turn out to be benign, but the examination is how the important minority are caught early.
Does a normal FIT mean I definitely don't have bowel cancer?
No test is perfect — a normal result makes it much less likely but doesn't exclude it, and it never overrides symptoms, which need their own assessment.
I'm under 50 with symptoms — what do I do?
Screening starts at 50, but symptoms at any age warrant assessment. Don't wait for a kit — get seen. Call 01926 935121.
Can I get a private colonoscopy without waiting for screening?
Yes — for symptoms, family history, or personal choice, a private colonoscopy can usually be arranged within days of consultation.
Related reading
Rather just get it looked at?
Mr Trif Papettas FRCS is a Consultant Colorectal and General Surgeon at Nuffield Health Warwickshire Hospital, Leamington Spa. A private consultation usually settles the question quickly — and any test or treatment, if one is needed at all, can typically be arranged within days.
Self-referrals welcome · No GP letter required · Self-pay and insured patients seen at Nuffield Health Warwickshire Hospital, Leamington Spa CV32 6RW