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Testing the family after a BARD1 result | CION Cancer Clinics
When one person tests positive for BARD1, each parent, brother, sister and adult child has a one-in-two chance of carrying the same fault. They can be tested for that one known change, which is simpler than the first test. This page explains who is usually offered testing first, how the process works, and what a positive or negative result means for each relative. At CION Cancer Clinics, our oncologists explain what a gene result means for you and your family, and plan the checks that follow.
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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
- Who in the family should be tested for BARD1?
- Which relatives are usually offered a test first?
- How does family testing actually happen?
- The terms used in family testing, in plain language
- What does each result mean for a relative?
- What this page cannot tell you
- Four things families tell us, and what is actually true
- Common questions about testing the family for BARD1
The short answer
Who in the family should be tested for BARD1?
Start with the closest adult relatives of the person who tested positive: parents, brothers, sisters and grown-up children. Each of them has a one-in-two chance of carrying the same fault. They are tested only for that one known change, which is simpler and cheaper than the first test.
Why the family matters
A BARD1 fault is inherited, so it rarely stops with one person. A relative who carries it can be offered closer breast screening. A relative who does not carry it can usually step back to routine screening, and that relief is the most common result of family testing.
Why men should be tested too
Fathers, brothers and sons carry and pass on BARD1 just as often as women. A man may never be affected himself, yet his daughter can inherit the fault from him. Leaving the men out is one of the commonest reasons a family pattern is missed.
Testing is always a choice. No relative should be tested without agreeing to it themselves.Who to think about
Which relatives are usually offered a test first?
Testing moves outward through the family, one step at a time. Each positive result opens the next branch.
Parents
Finding out which parent carries the fault tells you which side of the family to follow next. If one parent has died, the pattern of cancers on each side can still point the way.
Brothers and sisters
Each has an even chance of carrying the same fault. Sisters are offered it because a positive result changes their screening. Brothers are offered it because of their children.
Adult children
Sons and daughters can be tested once they are adults and can decide for themselves. BARD1 raises risk only in adult life, so childhood testing is not advised.
Usually waits until
- The child is an adult
- They have had counselling of their own
- The result could change their care
The wider family
Aunts, uncles and cousins on the carrier side come next, once a parent's result shows which branch to follow. In large families, one person often coordinates the letters and appointments.
Not sure whether this applies to you?
Ask an oncologistStep by step
How does family testing actually happen?
The carrier gets a copy of the report
The exact variant name on the first report is what every relative's laboratory needs. Keep a clear copy, and share a photo of it only with relatives who ask.
Relatives are told
Most families use a short family letter written with the counsellor. It explains the result in plain words and can be shared on WhatsApp or printed. A Telugu version helps elders read it themselves.
Each relative sees a counsellor
Before testing, each person talks through what a positive or negative result would mean for them, including insurance and marriage questions. This can happen in Hyderabad or by phone from a district.
A targeted test for the one known change
A blood or saliva sample is checked only for the family's variant. Relatives in another state or abroad can usually test locally with the report in hand.
Results and a plan
Carriers are given a screening plan. Non-carriers are told what, if anything, still applies to them because of the family history.
Words you will hear
The terms used in family testing, in plain language
- Cascade testing
- Testing relatives one step at a time, starting with the closest, once a fault is found in one person.
- Index case
- The first person in the family found to carry the fault. Their report is the key every other test depends on.
- First-degree relative
- A parent, brother, sister or child. They share about half their genes with you.
- Targeted test
- A test that looks only for the one variant already found in the family, instead of a full panel.
- True negative
- A relative who does not carry the family's known fault. Their gene-related risk returns to that of the general population.
- Uninformative result
- A negative test when no fault has been found in the family. It cannot rule out an inherited cause.
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Side by side
What does each result mean for a relative?
Carries the family fault
Does not carry it
Closer breast screening, usually from around forty
Routine screening, unless family history says otherwise
Their own children may be offered a test as adults
Their children cannot inherit it from them
The branch of the family behind them is followed up
That branch can usually stop testing
Counselling on the next steps
A clear answer, and often real relief
Being straight with you
What this page cannot tell you
It cannot tell you which of your relatives carries the fault. Only a test can do that. It also cannot decide for a relative whether to be tested. What your specific variant means is a question for the counsellor who ordered the test.
It cannot settle the insurance question
India has no dedicated law protecting people from genetic discrimination in insurance. Relatives who are worried about cover should raise it with the counsellor before testing, not afterwards.
Who this does not apply to
If the first person tested had only a variant of uncertain significance, meaning a change the laboratory cannot yet classify, relatives should not be tested for it. Families where no fault was found also have nothing specific to test for. In both cases, screening is guided by the family history instead.
Tumour testing to guide treatment is a different test, covered under targeted therapy.Commonly believed
Four things families tell us, and what is actually true
"My sister tested negative, so I must be negative too."
Each brother or sister inherits separately. One sibling's result says nothing about another's. Each person needs their own test.
"It came from my mother's side, because she had cancer."
Often, but not always. A father can carry BARD1 without ever being ill. Testing a parent is the only way to know which side it came from.
"Our young children should be tested now, to be safe."
BARD1 raises risk only in adult life, and nothing is done differently in childhood. Waiting lets your children make the choice themselves when they are older.
"If I test positive, it will ruin a marriage proposal."
A BARD1 result is a statement about risk that can be managed with screening. A counsellor can help you think through when and how to share it.
Questions we are asked
Common questions about testing the family for BARD1
What are the chances my brother or sister carries it too?
Each brother or sister has a one-in-two chance, like a coin toss, and each toss is separate. In one family several siblings may carry it, and in another none may. Only a test answers the question for each person.
Is the family test the same as the one I had?
No. Your test searched many genes. A relative's test looks only for the one BARD1 change already found in you. That makes it simpler, often cheaper and usually quicker. The laboratory needs a copy of your report to know exactly what to look for.
Should my father or brother be tested even though men are not screened?
Yes, if they are willing. A man's result tells his daughters and sons whether they need testing, and it shows which side of the family to follow next. His own care may not change much, but the family's picture does.
At what age can my children be tested?
Usually once they are adults and can decide for themselves. BARD1 does not change anything in childhood, because screening only begins in adult life. Waiting protects their right to choose. Your counsellor can help you plan how and when to tell them.
How do I tell relatives who live far away?
A family letter, written with the counsellor, can be sent by WhatsApp or post. It names the gene and the exact variant so a local laboratory can test for it. Relatives in another state or abroad can usually test near home and share the result with their own doctor.
What if a relative does not want to know?
That is their right, and it should be respected. Share the information once, clearly, and let them know it is there if they change their mind. Many people come back to it later, often when a life event such as marriage or a new diagnosis makes it feel relevant.
Our parents are cousins. Does that change anything?
It can mean the same fault appears on both sides of the family tree, which makes the pattern harder to read. Tell your counsellor about any marriage within the family so both sides are mapped properly. It does not change the one-in-two chance for each child of a carrier.
Who pays for relatives' tests?
Usually each relative or the family pays, and insurance rarely covers testing in someone without cancer. Because a targeted test looks for one change only, it generally costs less than the original panel. Ask the CION team for the current price before booking.
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
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Sources
- National Cancer Institute — Genetic Testing for Inherited Cancer Susceptibility Syndromes
- National Cancer Institute — Genetics of Breast and Gynecologic Cancers (PDQ) - Health Professional Version
- NCCN — Genetic/Familial High-Risk Assessment: Breast, Ovarian, Pancreatic, and Prostate
- NHS — Predictive genetic tests for cancer risk genes
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
Cascade testing: how a result moves through a familyThe general method behind family testingWhat to send a relative: the family letterWording you can adapt and shareSurveillance for BARD1 carriersWhat a relative who tests positive is offeredBARD1 positive: what happens nextThe first steps for the person who tested positive
Talk to us
Want help telling your family about a BARD1 result?
A genetic counsellor can help you write a family letter and arrange targeted tests for relatives, in Telugu if you prefer. One helpline serves every CION centre.