Free Online Cancer Risk Assessment —
Screen 20+ Cancers in 2 Steps
Two free tools in one place. Start with a 10-minute questionnaire covering 6 major cancers (breast, lung, colorectal, prostate, melanoma, cervical), then optionally run a CBC blood test screen that flags signals across 20+ cancers — all from a simple, standard blood test. Not a diagnosis.
Free · 10 minutes · Results saved privately
Quick answer
A cancer risk assessment is a structured 10-minute questionnaire that estimates your personal risk of developing major cancers, based on family history, lifestyle, age and exposures. ScanSkinAI's free online assessment covers 6 cancers — breast, lung, colorectal, prostate, melanoma and cervical — and returns a personalised screening plan aligned with NCI, ACS and USPSTF guidelines. It is a preventive screening tool, not a diagnostic test.
Key takeaways
- A cancer risk assessment is a 10-minute questionnaire that estimates your personal risk of developing major cancers based on family history, lifestyle, age and exposures.
- ScanSkinAI's free online assessment covers 6 cancers — breast, lung, colorectal, prostate, melanoma and cervical — aligned with NCI, ACS and USPSTF screening frameworks.
- An optional CBC (Complete Blood Count) blood-test screen turns a standard lab report into pattern-based flags for signals associated with 20+ blood, immune and solid-organ cancers — completely free.
- It is not a diagnostic test and cannot detect cancer. It tells you whether to screen earlier, more often, or with a different test — and which screenings to prioritise.
- Results are private. Nothing is sold or shared with insurers, employers or advertisers, and you can delete your record any time.
What is a cancer risk assessment?
A cancer risk assessment is a structured way of looking at your personal cancer risk before you have any symptoms. Instead of waiting until something goes wrong, you answer focused questions about your family history, lifestyle, age, prior medical events and environmental exposures — and a validated risk model translates those answers into a per-cancer risk tier and a personalised screening calendar.
The assessment does not check your DNA, your blood, or any tissue sample. It is not a diagnostic test, and it cannot tell you whether you currently have cancer. What it can do is something just as important: tell you which cancers you specifically are most at risk for, and which screening tests (mammogram, colonoscopy, low-dose CT, PSA, Pap/HPV or a skin check) you should prioritise and when.
The risk model behind ScanSkinAI's assessment is aligned with the same frameworks clinicians use — the National Cancer Institute (NCI), the American Cancer Society (ACS) and the U.S. Preventive Services Task Force (USPSTF) — plus condition-specific tools like the Gail model for breast cancer, PLCOm2012-style cues for lung cancer, Tyrer-Cuzick for familial breast risk, and standard melanoma risk indices.
The 6 cancers covered
Together, these account for the majority of preventable cancer deaths in adults — and all have validated screening pathways.
Breast cancer
Family history, BRCA1/2 cues, hormonal history, breast density and lifestyle.
Learn moreMelanoma & skin cancer
Fitzpatrick skin type, sunburn history, tanning beds, mole burden and biopsies.
Learn moreWorried about a specific mole or skin spot? Use the free Skin Cancer Check or the AI Mole Checker instead.
How the assessment works
Three steps, about 10 minutes, no clinic visit required.
Answer focused questions
About 10 minutes covering each of the 6 cancers and shared risk drivers — no medical jargon.
AI risk modelling
Each answer is weighted against NCI/ACS/USPSTF-aligned factors to compute per-cancer risk tiers.
Get your action plan
Screening recommendations, lifestyle interventions and a reminder calendar saved to your tracker.
Why take an online cancer risk assessment?
6 cancers in one assessment
Personalised risk for breast, lung, colorectal, prostate, melanoma and cervical cancers — combined in one 10-minute flow.
About 10 minutes
Focused questions on family history, lifestyle, exposures and prior screenings — no clinic visit required.
Three-tier risk score
Low / Moderate / High score for each cancer plus an overall preventive priority view you can share with your GP.
Personalised screening plan
Age- and risk-matched guidance: mammogram, colonoscopy, low-dose CT, PSA, Pap/HPV and skin checks.
Reminder timeline
Suggested re-check intervals so screenings never lapse — synced to your tracker.
Free & confidential
Results stay in your private account. Never sold, never shared with insurers or employers.
What the assessment measures
Risk is layered. The assessment combines four families of risk factors into each per-cancer score.
Family history & genetics
First- and second-degree relatives, BRCA1/2 cues, Lynch syndrome flags, early-onset cancers.
Lifestyle signals
Smoking pack-years, alcohol use, BMI, physical activity and broad dietary patterns.
Environmental exposures
UV exposure, radon, asbestos, occupational chemicals and HPV exposure history.
Personal medical history
Prior biopsies, IBD, hormonal therapy, prior cancers and your full screening history.
Who is the cancer risk assessment for?
Anyone can take it — but six groups get the highest practical value from running through the questionnaire and acting on the result.
Adults 30+
Most major-cancer screening programmes start between 40 and 50. This assessment helps you see whether your personal risk profile means starting earlier.
Family history of cancer
A first-degree relative with breast, colorectal, prostate or melanoma cancer changes your screening calendar. The assessment quantifies by how much.
Current or former smokers
Lung-cancer screening with low-dose CT can cut mortality by ~20% in eligible adults. The assessment checks pack-years against USPSTF eligibility.
Outdoor workers & sun-exposed adults
High lifetime UV exposure raises melanoma and non-melanoma skin-cancer risk. Pair the assessment with the ScanSkinAI mole checker for visual screening.
People due a check-up
If it has been years since your last preventive visit, the assessment gives you a structured talking-points list to take to your GP.
Carers planning for parents
Use the assessment for a relative over 60 to prioritise the screenings most likely to catch something early.
Where the risk model comes from
The ScanSkinAI cancer risk assessment is not a black box. The risk weights are aligned with publicly documented frameworks that clinicians, public-health bodies and cancer charities already use to decide who should be screened, how early, and how often.
- NCI (National Cancer Institute) — risk-factor categories and population baselines.
- ACS (American Cancer Society) — age-banded screening intervals.
- USPSTF — Grade A/B preventive screening recommendations.
- Gail model & Tyrer-Cuzick — breast-cancer risk estimation.
- PLCOm2012-style cues — lung-cancer risk among ever-smokers.
- Standard melanoma risk indices — Fitzpatrick skin type, mole burden, sunburn and tanning-bed history.
The cancer risk assessment is a preventive, educational risk-stratification tool — it is not a medical device and does not provide a diagnosis. The wider ScanSkinAI platform operates under ISO 13485 quality management and ISO 27001 information-security controls. For more on how we validate clinical content, see the ScanSkinAI Evidence Base.
CBC Blood Test Cancer Screen
A different kind of test. The 6-cancer questionnaire above asks about your history. The CBC screen looks at your current blood. It is a standalone, free tool that turns any standard Complete Blood Count (CBC) lab report into pattern-based flags for signals linked to 20+ cancers.
Questionnaire vs CBC screen — what's the difference?
6-Cancer Questionnaire
- • Input: your history & lifestyle
- • Output: long-term risk tier per cancer
- • Covers 6 major cancers
- • Best for: planning future screenings
CBC Blood Test Screen
- • Input: your CBC lab values
- • Output: current biological flags
- • Covers signals across 20+ cancers
- • Best for: making sense of an existing CBC
Markers analysed
- WBC total + 5-part differential
- Neutrophils, Lymphocytes, Monocytes, Eosinophils, Basophils
- RBC, Haemoglobin, Haematocrit
- MCV, MCH, MCHC, RDW — red-cell shape & size
- Platelets — paraneoplastic & thrombocytosis patterns
- Neutrophil-to-Lymphocyte Ratio (NLR) — inflammatory cancer signal
- Platelet-to-Lymphocyte Ratio (PLR) — solid-tumour prognosis marker
Signals across 20+ cancers
The CBC screen flags blood-pattern signals associated with both haematological and solid-organ cancers:
How the CBC cancer screen works
- 1. Grab any recent CBC report. Most adults already have one from a routine check-up, pregnancy work-up, pre-op blood test or hospital visit. Any lab format works — UK, EU, US units auto-detected.
- 2. Enter the values. Type in the 12–15 standard markers. The form takes about 3 minutes.
- 3. Get a pattern-based report. The screen highlights values outside the reference range, then flags combinations of values associated with specific cancer types — not just single abnormal numbers.
- 4. Take the report to your GP. Each flag includes the suggested follow-up (peripheral blood smear, ferritin, LDH, faecal immunochemical test, imaging, haematology referral) so you walk in with a structured talking-points list.
Accuracy, evidence & what it can / cannot do
The CBC is one of the most studied lab tests in medicine. Decades of haematology and oncology research have linked specific CBC patterns to specific cancer risks. Our screen does not invent new biomarkers — it applies published rule-based logic to your values.
What it can do
- • Flag abnormal patterns most associated with cancer
- • Translate lab jargon into plain English
- • Compute derived ratios (NLR, PLR) automatically
- • Suggest the right follow-up test or referral
- • Give you a printable summary for your GP
What it cannot do
- • Confirm or rule out cancer
- • Replace bone-marrow biopsy, imaging or tumour markers
- • Diagnose any specific disease
- • Replace a haematologist or oncologist
- • Catch cancers that don't affect blood counts
Reported sensitivity of CBC-based signals varies by cancer type: very high for chronic leukaemias and polycythaemia vera (where CBC alone is often the first abnormality detected), moderate for lymphoma and myelodysplastic syndromes (typically requires confirmation with blood film + biopsy), and lower but still useful for solid-organ cancers where anaemia, thrombocytosis or NLR elevation are supporting signals rather than diagnostic ones.
The logic is aligned with published references including NICE NG12 (suspected cancer pathways), BSH (British Society for Haematology) guidance on persistent cytopenias, and peer-reviewed work on NLR/PLR as prognostic indicators in oncology. For more on how clinical content is validated, see the ScanSkinAI Evidence Base.
Who benefits most from the CBC cancer screen
Inside the tool, choose "Skip to CBC blood test (20+ cancers)" to go straight to the CBC form — or run the 6-cancer questionnaire first and stack both views.
Important: this is not a cancer test
A cancer risk assessment estimates your likelihood of benefiting from earlier or more frequent screening. It cannot detect cancer, and it does not replace a clinician, blood test, scan, biopsy or emergency care. If you have any new lump, unexplained bleeding, persistent cough, unexplained weight loss, or a mole that is changing in size, shape or colour, contact a clinician immediately.
Related cancer & skin screening tools
Pair the assessment with these free tools to cover both risk modelling and visual screening.
6-Cancer Risk Check
The full questionnaire — 10 minutes, free, saved to your account.
Open toolFree Skin Cancer Risk Quiz
Take our free skin cancer risk quiz — a skin-only version focused on melanoma risk factors. 2 minutes, no signup.
Open toolCBC Blood Test Cancer Screen
Upload or enter your CBC results — get pattern flags for 20+ cancers. Free.
Open toolSkin Cancer Check
Free online skin cancer screening with AI-powered photo analysis.
Open toolAI Mole Checker
Photo-based mole screening using ABCDE criteria — free.
Open toolABCDE Mole Tracking
Track a specific mole over time and detect early changes.
Open toolAI Dermatologist
Instant AI skin check from a photo — 80+ conditions covered.
Open toolMelanoma Checker
Focused melanoma risk screening for moles you're worried about.
Open toolFrequently asked questions
Ready to see your personalised cancer risk?
10 minutes. Free. Saved to your private account. Aligned with NCI, ACS and USPSTF guidelines.
Start free cancer risk assessmentNo credit card · Result in 10 minutes · Not a diagnosis