Medical Oncologist
CION Cancer Clinics
At what age should screening start? | CION Cancer Clinics
The right age to start surveillance is not one number. It depends on which gene you carry, which organ is being watched, and how young the earliest diagnosis in your family was. This page explains what actually sets your starting age and how it can move earlier over time. At CION Cancer Clinics, our team helps carriers and their families plan checks, next steps and support after a genetic result.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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On this page
- At what age should screening actually start?
- Three things that decide when you start
- How your own starting age gets fixed
- Words used to explain a starting age
- Guideline age against a family-adjusted age
- What this page cannot tell you
- Four things families tell us, and what is actually true
- Common questions about starting ages
The short answer
At what age should screening actually start?
There is no single age. The starting point is set by which gene you carry, and it can move earlier still if a close relative was diagnosed young. Two people with the same fault can be given different starting ages if their family histories differ.
The guideline age is a floor, not a fixed date
Published guidelines give a default starting age for each gene and each organ. That default assumes an average family history. Yours may not be average, and your counsellor will adjust the starting age earlier where the family record calls for it.
Why starting too late defeats the purpose
Surveillance only helps if it begins before the age the cancer typically appears in that syndrome. Starting on schedule, rather than whenever it becomes convenient, is what actually changes outcomes. A programme begun after that window has already opened can still help, but it has lost the head start it was designed to give you.
Why the same gene can give two different answers
A counsellor weighing your case is not reading a single line from a chart. They are comparing the published guideline against your own family's pattern, and choosing the earlier of the two whenever the family pattern points that way. That is why two cousins carrying the identical fault can walk out of the same clinic with different starting dates written on their plans.
The starting age is set once your gene and family history are both known. It is not something to estimate on your own.What actually sets the age
Three things that decide when you start
Your counsellor weighs all three together rather than picking the one that gives the earliest answer.
The specific gene
Different genes carry different guideline starting ages for the same organ. Two breast cancer genes on the same testing panel can have different recommended starting points.
The organ in question
One gene can carry several different starting ages across the organs it affects, because risk for each organ rises at a different point in life.
Your family's youngest diagnosis
If a close relative was diagnosed unusually young, your own starting age is often set earlier than the guideline default, a principle explained on its own page.
Ask your counsellor about
- Which relative counts as the youngest case
- Whether that moves your own starting age
Not sure whether this applies to you?
Ask an oncologistHow the decision is made
How your own starting age gets fixed
Confirming the gene
A laboratory report naming the exact gene and variant comes first. The starting age cannot be set from a family story alone.
Building the family tree
Your counsellor asks who was diagnosed, with what, and at roughly what age, across both sides of the family.
Checking the guideline default
The relevant guideline gives a starting age for your gene and each organ it affects, used as the baseline before any adjustment.
Adjusting for your family
If your family's youngest case sits well before the default, your starting age is usually moved earlier to match.
On your report
Words used to explain a starting age
- Guideline default
- The starting age published for a gene and organ, assuming an average family history.
- Index case
- The first person in the family found to carry the fault, usually through their own diagnosis.
- Youngest affected relative
- The relative diagnosed at the earliest age. This age is often used to move a starting point earlier for the rest of the family.
- Baseline scan
- Your first scan on the programme, taken at your starting age and used to judge every later scan against.
- Risk window
- The span of years during which a particular organ carries the raised risk that surveillance is designed to catch.
Side by side
Guideline age against a family-adjusted age
Guideline default
Family-adjusted starting age
Built for an average family history
Built around your family's actual youngest case
Same for every carrier of that gene
Different from one family to the next
A reasonable starting point where no early cases exist
Used where a relative was diagnosed unusually young
Set once the gene is known
Set once the gene and family tree are both known
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Being straight with you
What this page cannot tell you
It cannot give you your own starting age. That number depends on your exact gene, the organ, and your family's youngest diagnosis, and it is worked out by a genetic counsellor who has all three in front of them, not read off a general table.
It cannot tell you what to do if you have already passed it
If you suspect you are already older than your starting age should have been, that is a reason to book sooner rather than to assume it no longer applies. Catching up matters more than waiting for a perfect moment.
Who this does not apply to
If genetic testing has not confirmed a specific fault in your family, there is no gene-specific starting age to apply. Screening advice in that situation is built from family history alone, and your doctor can guide you through it.
If nobody has told you a starting age, that is a gap worth raising at your next appointment, not something to work out yourself.Commonly believed
Four things families tell us, and what is actually true
"I will start screening once I reach the age my mother was diagnosed."
Waiting for that exact age can mean starting too late. Guidelines usually recommend beginning some years before the youngest diagnosis in the family, not on the same date.
"The starting age is the same for every gene."
It is not. Different genes carry different starting ages for the same organ, and one gene can carry several different starting ages across the organs it affects.
"If I feel fine, I can push my start date back."
Surveillance is designed to catch disease before symptoms appear. Feeling well gives no information about whether the starting age has already been reached.
"Younger relatives should start at the same age I did."
A younger relative's starting age is worked out separately, and can move earlier again if a new, younger diagnosis occurs in the family after yours.
Questions we are asked
Common questions about starting ages
Is there one age everyone with a cancer gene should start at?
No single age applies across every gene and organ. The starting point depends on which gene you carry, which organ is being watched, and how young the earliest diagnosis in your family was.
Can my starting age change over time?
Yes. If a younger relative is later diagnosed, your starting age can be reviewed and moved earlier, even if you have already begun a schedule based on an older guideline default.
What if I am already past the guideline starting age?
Book an appointment rather than wait. Beginning surveillance later than the recommended age is still worthwhile, and your counsellor will tell you whether any catch-up steps are needed.
Do children ever need to start surveillance?
For a small number of syndromes, yes, because the relevant cancers can occur in childhood. For most inherited cancer genes, surveillance waits until adulthood. Your counsellor will tell you which situation applies.
Does the starting age differ between men and women with the same gene?
Often, yes, because some organs at risk are sex-specific and others carry different risk levels between men and women carrying the same fault. Your plan is written for you specifically, not copied from a relative of the other sex.
Who actually decides my starting age?
A genetic counsellor or specialist familiar with your gene, working from your laboratory report and your family tree together. It is not something a general physician can set without that information.
Is a later starting age ever the right choice?
Occasionally, where a gene carries a very low risk for a particular organ, a later or less frequent schedule is appropriate. This is a clinical decision, not one to make from a general description online.
Where do I go to get my starting age confirmed?
Bring your genetic report and family history to a genetic counselling clinic. Call the CION helpline if you are not sure where to start, and someone will arrange the right referral.
Your Specialists
Meet CION's oncologists. Bring your family history or genetic report to them.
Our medical oncologists see people with a strong family history of cancer, arrange genetic counselling and testing where it fits, and plan the checks that follow.
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
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Sources
- NCCN — NCCN Guidelines for Patients: Genetic Testing for Hereditary Cancer
- National Cancer Institute — Genetic Testing for Inherited Cancer Susceptibility Syndromes
- Cancer Research UK — Inherited cancer genes and increased cancer risk
- GeneReviews (NCBI) — Hereditary Breast and Ovarian Cancer Syndrome
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
Surveillance for hereditary cancer risk: the complete pictureThe whole programme, before just the starting ageStarting ten years before the youngest case: the rule explainedThe specific rule behind most family-adjusted starting agesBreast MRI screening: what it involvesWhat the first scan on many programmes actually looks likeA printable personal surveillance planA place to record your own confirmed starting age
Talk to us
Not sure when your own surveillance should begin?
Share your gene report and family history and we will help you work out the right starting age with a genetic counsellor. One helpline serves every CION centre.