Hematologist
CION Cancer Clinics
Testing brothers, sisters and the wider family | CION Cancer Clinics
Yes, brothers and sisters should be offered testing. If you carry thalassaemia, one of your parents does too, so each sibling has a one in two chance of carrying the same gene. A blood count and an HPLC report answer the question for each person. This page explains who in the family to test, how to arrange it, what the results mean, and what it cannot tell you. At CION Cancer Clinics, our haematologist cares for anaemia, bleeding, clotting and inherited blood disorders, with ArogyaSri, CGHS and cashless insurance accepted.
BP
Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
17+specialists on panel
15,000+patients treated
35+centres across Telangana & AP
4.8★ / 800+Google rating
On this page
- Should brothers and sisters be tested for thalassaemia?
- Who in the family should be offered testing?
- How do you arrange testing for the family?
- What does a relative's result mean for them?
- What stops families from getting tested?
- Why test the brothers and sisters of a child with thalassaemia major?
- What can this page not tell you?
- Common questions about testing the family
The short answer
Should brothers and sisters be tested for thalassaemia?
Yes. If one person in the family is found to carry thalassaemia, or a child has thalassaemia major, their brothers and sisters should be offered a simple blood test. It tells each of them whether they carry the same changed gene before they plan a marriage or a pregnancy.
Why the result in one person matters to the rest
Thalassaemia is passed from parents to children through genes. If you carry it, you got it from one of your parents, so that parent is a carrier too. Each of your brothers and sisters then has a one in two chance of carrying the same gene. Your cousins, uncles and aunts on that side may carry it as well.
What being a carrier does and does not mean
A carrier is not ill and usually needs no treatment. The result matters for the next generation. When two carriers have children together, each pregnancy can be affected. Knowing early gives a couple the widest set of choices, and costs one blood test.
Testing is a choice for each adult. Offer it, explain why, and let each person decide for themselves.Across the family
Who in the family should be offered testing?
Start with the closest relatives, then widen the circle on the side of the family the gene came from.
Brothers and sisters
The first people to test. Unmarried siblings, and those planning a pregnancy, benefit most because every option is still open to them.
Parents
Testing both parents shows which side of the family carries the gene. That tells you whose relatives to approach next.
Helpful when
- Only one child has been tested
- Parents plan another child
Cousins, uncles and aunts
On the carrier parent's side, relatives may carry the gene too. This matters more where marriages within the family are common.
Your partner
If you are a carrier, your partner's result is the one that decides the chance for your children. Test your partner before or early in a pregnancy.
Children, when the time is right
Young children who are well usually do not need carrier testing. Many families wait until the child is old enough to understand, or is approaching marriage.
Not sure whether this applies to you?
Ask an oncologistStep by step
How do you arrange testing for the family?
-
Get the first person's full reports
Keep the blood count and the haemoglobin variant report, usually called HPLC. If a DNA test named the exact gene change, keep that too. Relatives' results are read against it.
-
Talk to the family
Explain what was found and why testing helps. Some relatives worry about marriage prospects. Share information, not pressure.
-
Book the same tests at a reliable laboratory
Each relative needs a blood count and HPLC. Using the same method makes results easier to compare.
-
Check iron if the result is unclear
Low iron can hide beta thalassaemia trait on the HPLC report. Your doctor may ask for an iron test and a repeat.
-
See a haematologist or counsellor with the results
Any relative who is a carrier, and especially any carrier couple, should have the result explained in person.
Reading the result
What does a relative's result mean for them?
The report says
What it usually means
Normal blood count and normal HPLC
Unlikely to carry beta thalassaemia. Some alpha carriers can still be missed
Small red cells with a raised HbA2
Usually beta thalassaemia trait. Test the partner before a pregnancy
Small red cells with a normal HbA2
Could be low iron, alpha trait, or masked beta trait. Needs further tests
HbS or HbE seen on HPLC
A different carrier pattern. Matters if the partner carries beta thalassaemia
"Borderline" or "suggest DNA study"
The screening test could not decide. A gene test is the usual next step
Leave a number, we will call you
One field. No form to fill in, and no charge for the call.
Commonly believed
What stops families from getting tested?
"Nobody else in the family is ill, so nobody else carries it."
Carriers look and feel well, so a gene can pass quietly through several generations. Only a blood test shows who carries it.
"If people find out, my sister will not get married."
This fear is real and common. But a carrier can marry and have healthy children, especially when the partner is tested. Not knowing is what leaves a couple without choices.
"My brother's blood count was normal, so he is clear."
A blood count alone can miss carriers. Ask for an HPLC report as well, and an iron test if the red cells are small.
"Carriers should take iron for their low haemoglobin."
Many carriers have plenty of iron. Iron taken without a test can build up and do harm. Take iron only when a test shows you need it and your doctor advises it.
When a child has thalassaemia major
Why test the brothers and sisters of a child with thalassaemia major?
When a child has thalassaemia major, both parents are carriers. Their other children have three possibilities: not a carrier, a carrier, or affected themselves. Testing each brother and sister clears up which applies.
A younger sibling who has not been tested
A baby or young child may have thalassaemia major without obvious signs at first. If a younger brother or sister is pale, tired, feeding poorly or not growing well, ask the child's doctor for a blood test soon rather than waiting.
Brothers and sisters as possible donors
For some children, a stem cell transplant is discussed as a treatment. A full brother or sister is the most likely matching donor, with a one in four chance of a full match. Matching needs a special tissue test called HLA typing, done at qualified transplant centres. Whether a transplant suits your child is a decision for the treating haematologist, and it does not suit every child.
Being straight with you
What can this page not tell you?
This page cannot read your family's reports. Carrier patterns vary, and alpha thalassaemia or rare variants may need gene testing to be sure. Reference ranges also differ between laboratories, and one result is read alongside iron levels and, where needed, a repeat test.
How CION can help
CION's haematology team, led by Dr. Basudev Pokhrel, reviews each relative's reports, explains what they mean and coordinates gene tests or tissue matching with qualified centres. CION does not perform HLA typing or transplants in-house.
What to ask
Ask whether each result is complete or needs a repeat after iron is checked. Ask whether a DNA test is worth doing for the first carrier in the family. Ask what testing costs, and whether Aarogyasri, PM-JAY, CGHS, ECHS, EHS or your insurance covers any of it. Scheme rules change, so check the current position.
Questions we are asked
Common questions about testing the family
My sister is a carrier. Does that mean I am one too?
Not necessarily. One of your parents is almost certainly a carrier, and each child of that parent has a one in two chance of carrying the gene. You may or may not have inherited it. Only your own blood test, with an HPLC report, can tell you.
Which test should relatives ask for?
A complete blood count and a haemoglobin variant test by HPLC. Mention that a family member is a carrier, so the laboratory and doctor read the result with that in mind. If the red cells are small, an iron test may be added to avoid a missed result.
Do relatives need to fast before the test?
Usually not. The blood count and HPLC can be done at any time of day. If an iron test is ordered at the same time, some laboratories prefer a morning sample, so ask when you book. Bring any earlier blood reports you have.
We are cousins planning to marry. Should we both test?
Yes, and before the wedding if you can. Relatives are more likely to carry the same gene. If both of you are carriers, counselling explains the chance for each pregnancy and the testing options. The result is information for planning, not a judgement on the marriage.
How do I tell relatives without upsetting them?
Keep it simple and private. Explain that a carrier is not ill, that one blood test answers the question, and that knowing helps with marriage and pregnancy plans. Some families find it easier when a doctor or counsellor explains it. Respect anyone who chooses not to test.
Can a brother or sister donate stem cells to our child?
Possibly. A full brother or sister is the most likely match, but many are not a match. Matching needs HLA typing at a qualified centre, and a sibling with thalassaemia major cannot donate. Carriers often can. Your child's haematologist decides whether a transplant is suitable at all.
Should we test our young children now?
If a child is unwell, pale or not growing, yes, ask for a blood test now. For a healthy child, carrier testing is usually not urgent. Many families wait until the child can understand the result, or until marriage plans begin.
Is family testing covered by schemes or insurance?
It varies. Some government programmes offer free screening, and some insurers cover tests linked to a diagnosis. Check Aarogyasri, PM-JAY, CGHS, ECHS, EHS or your insurer for the current rules, because scheme entitlements change. Ask the laboratory for the price before testing.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
Patient stories
Hear it from people we have treated
Every story is a video, in the patient's own words. Nothing here is a written testimonial.
Where to find us
Our centres in and around Hyderabad
Addressed by landmark, because that is how this city navigates. A haematology consultation can be booked at any of these centres through one helpline, and your team will tell you where each test or treatment takes place.
Warangal
Vizag
Sources
- NHS — Thalassaemia
- NHLBI — Thalassemias
- National Health Mission — National Health Mission, Government of India
- American Society of Hematology — Thalassemia
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
Genetic Counselling for Haemoglobin DisordersWhat happens when a carrier result is explainedTalking to Family About Carrier StatusHow to start the conversation with relativesPremarital Haemoglobinopathy ScreeningTesting both partners before marriageCarrier Screening and Genetic CounsellingThe full guide to carrier screening
Talk to us
Unsure what a relative's report means?
Tell us what has been found so far. Our haematology team will explain the result and help you plan testing for the rest of the family.