Medical Oncologist
CION Cancer Clinics
Testing children: when it is right, and when it can wait | CION Cancer Clinics
Most children in a family with a cancer gene should not be tested yet. The gene usually only matters from adulthood, and testing early adds worry without changing anything today. A small group of syndromes is different, and for those, waiting is the wrong choice. This page explains how the difference is decided. 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
- Should a child in the family be tested?
- The four questions a counsellor actually asks
- How the decision actually gets made
- Words used when the patient is a child
- Adult-onset gene or childhood-onset syndrome
- What this page cannot tell you
- What families assume, and what is actually true
- Common questions about testing children
The short answer
Should a child in the family be tested?
Usually not yet. Most of the genes that raise cancer risk act in adult life, and testing a well child for one of these adds worry without adding anything a doctor can act on before the child grows up. A smaller group of conditions is different: the cancers they cause can appear in childhood, so waiting is not the safe choice and testing early is what protects the child.
Why waiting is usually the right call
A fault in an adult-onset gene does not change anything about a child's care today. There is no scan or blood test that starts earlier because of it, and no medicine a child would be given. Knowing early only adds a label the child cannot yet decide what to do with, and takes away a choice that is rightly theirs to make once they are old enough to understand it.
When testing a child is not about waiting
A handful of inherited conditions cause tumours in the eye, kidney or other organs specifically in young children, and screening from infancy genuinely catches them earlier. For these, testing a child is not jumping the gun. It is how the surveillance programme knows which children need it and which do not.
Who actually decides
Parents give consent, but a genetic counsellor should be the one setting out which category the family's gene falls into before anyone signs anything. Ask directly: does this fault cause disease in childhood, or only from adulthood onward? The answer decides everything else.
A child cannot be tested "just to be sure" for a gene that only matters decades later. That is not caution, it is a decision being made for someone who has not been asked.What the decision turns on
The four questions a counsellor actually asks
None of these is about how anxious the family feels. All four are about the gene and the child.
Does the gene cause disease in childhood?
If every known case in this family and in the medical literature starts in adult life, there is nothing to watch for yet. If it can appear young, that changes the whole conversation.
Is there a surveillance programme that only works if started early?
Some organs can be screened from infancy with a scan and a paediatric specialist watching the results. Where that exists, a result tells the team who to enrol.
Does the child already have cancer?
A child who has been diagnosed is tested for a different reason entirely: to explain why, and to check whether siblings need watching. That is diagnostic testing, not a prediction about the future.
Is the child old enough to be part of the conversation?
An older child or teenager can usually understand what is being asked and why. Leaving them out of a decision about their own body, even when they are still a minor, tends to cause more distress later than including them does now.
Not sure whether this applies to you?
Ask an oncologistIn practice
How the decision actually gets made
The family's exact gene is confirmed first
Before anyone discusses a child, the counsellor confirms exactly which fault runs in the family, from the relative who was tested and found positive.
That gene is sorted into one of two groups
Adult-onset, where testing waits, or childhood-onset, where it does not. Some genes carry both kinds of risk, which the counsellor will explain plainly rather than leaving you to guess.
Parents are counselled separately from the child
What the result would mean, what it would not mean, and what happens with either result, before the family talks to the child together.
The child is included where they are able to be
A counsellor experienced with children can explain a test in language the child follows, and ask whether the child wants to know.
Testing happens only once everyone has agreed
Nobody is tested to settle a disagreement between adults in the family. If parents disagree, that conversation happens first.
Terms you will hear
Words used when the patient is a child
- Predictive testing
- Testing a well person, including a child, to see whether they carry a fault already known in the family. This is what is usually delayed for adult-onset genes.
- Diagnostic testing
- Testing a child who already has cancer, to find out whether an inherited fault explains it. This is not delayed, because it changes what is done for the child and their siblings now.
- Assent
- An older child's own agreement to be tested, given alongside their parents' consent. It is not legally binding the way adult consent is, but most genetic services will not proceed without it.
- Surveillance programme
- A schedule of check-ups and scans for someone at raised risk, built around the specific gene involved rather than applied generically.
- Paediatric genetic counsellor
- A counsellor with specific training in talking to children about inherited risk, separate from the training used for adult patients.
- Right to an open future
- The principle that a child should be able to grow up and decide for themselves whether to learn something that will not affect them until adulthood.
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Side by side
Adult-onset gene or childhood-onset syndrome
Adult-onset gene fault
Childhood-onset syndrome
Testing usually waits until the child is an adult
Testing is usually offered soon after birth or in early childhood
Nothing changes about the child's care today
A result decides which surveillance programme the child joins
The child chooses whether to test, later
Parents decide on the child's behalf, with the counsellor's guidance
Example pattern: cancers of the breast, ovary or bowel appearing in adult relatives
Example pattern: a tumour of the eye or kidney appearing in a very young relative
Being straight with you
What this page cannot tell you
It cannot tell you which group your family's gene belongs to. That depends on the exact gene and sometimes the exact fault within it, and getting it wrong in either direction is not a small thing. A genetic counsellor who knows the specific result already found in your family is the only person who should answer this.
It cannot make the decision for your family
Two parents can hear the same facts and reasonably reach different views about when a child should know. Where the gene is adult-onset, there is time to talk this through properly rather than deciding quickly.
Who this does not apply to
If nobody in your family has a confirmed gene fault, there is nothing yet to test a child for. A family history on its own, without a positive result in a relative, is watched rather than tested.
If you are unsure which group applies to your family, call the helpline with the exact gene name from the relative's report. Someone will tell you honestly whether a child's testing question even arises yet.Commonly believed
What families assume, and what is actually true
"Testing early means we can protect our child sooner."
For adult-onset genes, there is nothing to protect the child from yet, and no test or scan starts earlier because of a result. Protection begins when adult screening starts, not when the gene is known.
"If we don't test now, we might forget or lose track later."
Genetic services keep family records for exactly this reason. A counsellor can flag your child's file so that the right conversation happens when the child is old enough, without testing happening early.
"A doctor will test my child if I just ask."
Reputable genetic services in India follow the same professional guidance and will decline to test a well child for an adult-onset gene, however strongly a parent asks. This is not obstruction, it is the accepted standard of care.
"One test covers every gene, so we may as well test now."
A panel test can report on genes nobody asked about, including ones that would not have been offered to a child on their own. This is one reason families are counselled before testing, not just handed a form.
Questions we are asked
Common questions about testing children
Can I insist my child is tested even if the doctor advises against it?
You can ask, but a genetic service is entitled to decline testing a well child for an adult-onset gene, and most reputable ones will. If you disagree with the advice, ask for the reasoning in writing and discuss it further with the counsellor.
What if my child already has cancer?
That is a different situation. Testing a child who is already unwell is diagnostic, not predictive, and it is offered because it can change treatment and tells you whether siblings need watching.
At what age can my child decide for themselves?
There is no fixed age in law. In practice, counsellors involve teenagers directly in the conversation and look for their own agreement alongside a parent's consent, rather than applying one cut-off to everyone.
Will this affect my child's school life or sport?
For an adult-onset gene, no, because nothing about the child's health has changed. For a childhood-onset syndrome under active surveillance, the counsellor or paediatric team will tell you if any activity needs adjusting.
Can we test just to plan for the future, without telling our child yet?
Most services will ask why the result is needed now if nothing will be done with it before the child is grown. If there is no medical reason to know today, the usual advice is to wait and let your child ask when they are ready.
Does refusing testing now close the door for later?
No. The family's result stays on record, and your child can ask for testing themselves once they are an adult. Nothing is lost by waiting for an adult-onset gene.
Who talks to my child, us or the counsellor?
Usually both, in stages. The counsellor will often meet the child with you present, using language suited to their age, and will guide you on what to say between appointments.
How do we find out which group our gene falls into?
Bring the relative's genetic report, with the exact gene name, to a genetic counsellor. Call the CION helpline if you are not sure where to start, and someone will point you to the right clinic.
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
- National Cancer Institute — Genetic Testing for Inherited Cancer Susceptibility Syndromes
- Cancer Research UK — Genetic testing for children and young people
- GeneReviews (NCBI) — Genetic Counseling
- MedlinePlus Genetics — Should I have genetic testing for cancer risk?
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
Which syndromes do require childhood testingThe short list where waiting is the wrong callWhy most adult-onset genes are not tested in childhoodThe reasoning behind the standard advice, in fullWhen a childhood cancer suggests an inherited causeFor a child already diagnosed, not a well childShould healthy siblings be tested?The related question once one child has been diagnosed
Talk to us
Not sure if your family's gene is one that waits?
Tell us the gene named in your relative's report and we will tell you honestly whether a child's testing question even arises. One helpline serves every CION centre.