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CION Cancer Clinics
Planning a family when one of you has NF1 | CION Cancer Clinics
If one parent has NF1, each pregnancy has a one in two chance of passing it on. No test can tell how mild or severe it would be in that child. Couples have real choices, from natural conception to testing in pregnancy or IVF with embryo testing. This page explains each option, what it can and cannot tell you, and where to begin. 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
- Will my child inherit NF1?
- What are the options when one partner has NF1?
- How should a couple plan a pregnancy with NF1?
- What do the family-planning terms mean?
- Testing in pregnancy or testing embryos: how do they compare?
- What this page cannot tell you
- Four things couples are told, and what is actually true
- Common questions about NF1 and having children
The short answer
Will my child inherit NF1?
If one parent has NF1, each pregnancy has a one in two chance of passing it on. It makes no difference whether the mother or the father has it, or whether the baby is a boy or a girl. Nobody can predict how mild or severe NF1 would be in that child.
Every pregnancy is a fresh chance
The one in two chance applies to each pregnancy separately. Having one child with NF1 does not mean the next will be clear, and having a child without it does not make the next one more likely to have it. Think of it as a coin toss that starts again each time.
Why severity cannot be predicted
NF1 varies widely, even inside one family. A parent with a few skin spots can have a child with more serious problems, and the reverse. No test, before or during pregnancy, can tell you how NF1 would affect a particular child. This is the hardest part for many couples, and it deserves time with a counsellor.
If neither parent has NF1 and a child is born with it, the chance for the next pregnancy is low, though not zero.Your choices
What are the options when one partner has NF1?
There is no right answer. Couples choose differently, and each of these is a reasonable choice.
Conceive naturally, without testing
Many couples take the one in two chance and focus on early care. A child found to have NF1 starts regular check-ups from infancy.
Conceive naturally, test in pregnancy
A sample from the placenta or the fluid around the baby is tested for the family's NF1 change. The result shows whether the baby has NF1, not how severe it would be.
Needs first
- The parent's exact NF1 change, found by a gene test
- A plan, made before pregnancy, for what you would do with the result
IVF with embryo testing
Embryos made through IVF are tested, and only those without the family's change are placed in the womb. It avoids decisions later in pregnancy, but is costly and success is not certain.
Donor egg or sperm, or adoption
Using an egg or sperm from a donor without NF1 removes the chance of passing it on. Some families choose adoption. Both are valid paths.
Not sure whether this applies to you?
Ask an oncologistBefore you try for a baby
How should a couple plan a pregnancy with NF1?
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See a genetic counsellor together
Go as a couple, ideally a few months before trying. The counsellor explains the chances, the options and their costs, in Telugu if you prefer.
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Find the family's exact NF1 change
Pregnancy and embryo testing only work if the parent's change is known. The gene test can take several weeks, so arrange it early.
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Decide which option suits you
Take time. Talk through how you would feel about each possible result. Many couples find it helps to involve one trusted family elder.
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If the mother has NF1, plan her pregnancy care
Neurofibromas can grow or new ones appear during pregnancy. Blood pressure needs closer checks. Tell the anaesthetist about any lumps near the spine before delivery.
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After birth, have the baby examined
Even without testing, a doctor who knows NF1 can check the baby's skin in the first year and start eye checks if needed.
Words you will hear
What do the family-planning terms mean?
- Dominant inheritance
- One faulty copy of the gene is enough to cause the condition. This is why the chance is one in two.
- De novo
- A gene change that appears for the first time in a child. About half of people with NF1 are the first in their family.
- Mosaic NF1
- NF1 present in only some of a person's cells. The chance of passing it on is lower, but a child who inherits it has full NF1.
- CVS
- Chorionic villus sampling. A small piece of placenta is taken late in the first trimester for testing.
- Amniocentesis
- A sample of the fluid around the baby, taken early in the second trimester.
- PGT-M
- Testing IVF embryos for one known family gene change before one is placed in the womb.
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Side by side
Testing in pregnancy or testing embryos: how do they compare?
Testing in pregnancy
Testing embryos (PGT-M)
Done after a natural conception
Needs IVF, before pregnancy begins
Carries a small risk of miscarriage from the procedure
Carries the costs and uncertain success of IVF
A positive result raises a hard decision
Only embryos without the change are used
Cannot predict how severe NF1 would be
Cannot predict severity either
Being straight with you
What this page cannot tell you
It cannot choose for you. Each option carries different costs, risks and feelings, and couples weigh them differently. A genetic counsellor will lay them out without pushing you towards any of them.
The law in India
Testing a pregnancy for a genetic condition is permitted. Revealing or choosing a baby's sex is strictly prohibited, and no clinic will do it. Embryo testing is regulated under India's assisted reproduction law. Your clinic will explain the paperwork.
Who this does not apply to
If you are the brother or sister of someone with NF1 and have no signs yourself as an adult, you very likely do not carry it. Your children face no raised chance. A counsellor can confirm this, sometimes with a simple examination. Parents of a child with new NF1 face a low chance in future pregnancies.
Whether to tell a future spouse's family is a personal decision. A counsellor can help you think through how and when.Commonly believed
Four things couples are told, and what is actually true
"If my NF1 is mild, my child's will be mild too."
Severity is not passed on the way the gene is. A child can be affected more or less than the parent. This is why counsellors never promise a mild outcome.
"People with NF1 should not have children."
That is not medical advice anyone should give you. Many people with NF1 have healthy families. The choice is yours, and support exists whichever path you take.
"Only mothers pass it on."
Fathers pass on NF1 exactly as often as mothers. The chance is the same whichever parent carries it.
"Our first child has NF1, so the next one will be clear."
Each pregnancy starts again with the same chance. If a parent has NF1, every child faces the same one in two, whatever happened before.
Questions we are asked
Common questions about NF1 and having children
Is pregnancy safe for a woman with NF1?
Most pregnancies go well. Neurofibromas may grow or new ones appear, and blood pressure needs closer watching. A large lump in the pelvis or near the spine may affect delivery or an epidural, so tell your obstetrician early.
When should we see a genetic counsellor?
Before you start trying, ideally several months ahead. Finding the family's gene change can take several weeks, and options like embryo testing need planning. If you are already pregnant, call straight away, because testing in pregnancy is time-sensitive.
Can a test in pregnancy tell how severe NF1 will be?
No. It can only show whether the baby has the family's NF1 change. It cannot show whether NF1 would be mild or severe. This is important to understand before deciding to test.
What does embryo testing cost in India?
It combines the cost of IVF with the cost of testing each embryo, so it is expensive and may need more than one attempt. Costs vary between clinics. Our page on embryo testing costs sets out what to ask for in a written estimate.
We had a child with NF1 but neither of us has it. Could it happen again?
The chance is low, because the change usually arose for the first time in that child. It is slightly above that of other couples, since a parent can occasionally carry it in some egg or sperm cells. A counsellor can talk you through this.
Should I tell my partner's family before marriage?
That is your decision. Many people find it easier to share early, with accurate information, than to have it discovered later. A counsellor can join that conversation and explain NF1 to the family in plain terms.
Can the gene change be fixed in an embryo?
No. A gene change cannot be corrected in an embryo or a baby. Embryo testing selects embryos without the change. It does not alter the ones that have it.
Where do we start?
Bring the affected parent's medical records and any gene report you already have. A counsellor will start from there. Call the CION helpline if you are not sure who to see, 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
- GeneReviews (NCBI) — Neurofibromatosis 1
- MedlinePlus Genetics — Neurofibromatosis type 1
- NHS — Neurofibromatosis type 1
- MedlinePlus Genetics — What are the different types of genetic tests?
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.
Talk to us
Planning a pregnancy and want to talk it through?
Tell us who in the family has NF1 and where you are in your planning. We will arrange a genetic counselling session, in Telugu if you prefer. One helpline serves every CION centre.