IVF and Genetic Disease: When There's a Risk of Passing It On

Updated 9/11/2026

Quick Answer

Does a serious genetic condition run in your family? Then IVF for genetic disorders can genuinely help. It can lower the chance of passing that condition on to your child.

How does this work? Through something called preimplantation genetic testing IVF. More specifically, it's called PGT-M IVF, which stands for Preimplantation Genetic Testing for Monogenic disorders. In simple words, this means testing embryos created through IVF for one specific condition, before placing one back inside the uterus. Only the embryos that don't carry the condition get used.

Here's something important to know. This isn't something you're forced to do. And it isn't the only option either. Some families choose to use donor eggs or sperm instead. Others prefer to test during pregnancy itself. And some choose not to test at all, letting things happen naturally. If your goal is IVF to avoid passing genetic disease on to your child, know this, there's no single "right" choice here. There's only the choice that feels right for your own family.

Why Would Someone Even Need This?

Let's keep this really simple.

Some health conditions are caused by just one faulty gene. Doctors call these single gene disorders. And yes, these can be passed down from a parent to their child.

So if you, your partner, or someone close in your family carries a gene for a serious condition like this, there's a real chance it could be passed on to your children too. How likely that is depends on exactly how the condition is inherited. This is honestly one of the most important conversations to have as part of family planning, especially if genetic disorders already run in your family.

Some examples of conditions where this kind of testing is commonly used include cystic fibrosis, sickle cell anaemia, Duchenne muscular dystrophy, Huntington's disease, thalassemia, and certain hereditary cancer genes like BRCA1 and BRCA2. And there are actually several hundred other conditions that can be tested for too.

So What Actually Happens, Step by Step?

Good news , most of this follows a regular IVF process. There's just one extra step added in the middle. Let's walk through it simply.

Step 1: Normal IVF steps. Eggs are collected from the ovaries. They're fertilised with sperm in a lab. Then they're allowed to grow into embryos over a few days.
Step 2: A tiny embryo biopsy. Once an embryo has grown enough, usually around day 5 or 6, a skilled lab expert carefully removes just a few cells from it. This is done very carefully, and today's techniques have made this step much safer than it used to be.
Step 3: Genetic analysis. Those few cells go to a special genetics lab. There, they're checked specifically for the exact genetic change known to run in your family.
Step 4: Picking the healthy embryo. Once results come back, only the healthy embryo, or embryos, that don't carry the condition are considered for transfer. Embryos that do carry the condition usually aren't used.
Step 5: Embryo transfer. One healthy embryo is placed into the uterus. This part works just like a normal IVF or frozen embryo transfer.

Wait, Are There Different Types of Genetic Testing?

Yes, and it helps to know the difference, since these terms get mixed up a lot.

PGT-M, for a single known condition. This is used when a specific condition already runs in your family. It checks embryos for that one particular genetic change.
PGT-A, for chromosome count. This checks if an embryo has the right number of chromosomes overall. It's often used after repeated miscarriages or failed IVF tries. It can also spot chromosomal abnormality issues like Down syndrome, but it isn't aimed at just one disease.
PGT-SR, for rearranged chromosomes. This is used when a parent's chromosome is arranged a little differently than usual, like being flipped or swapped in position. This can affect how it's passed down to a child.

If a specific inherited disease is your concern, PGT-M is usually the right one for you. Your fertility specialist can help confirm exactly which type applies to your case.

What Are Your Actual Choices Here?

If a serious genetic condition runs in your family, you actually have more than one path forward. Here they all are, simply laid out:

IVF with PGT-M: Test the embryos, and only use the ones without the condition.
Using donor eggs or sperm: This avoids the specific genetic risk completely, since the genetic material comes from someone without the condition.
Testing during pregnancy: Tests like chorionic villus sampling (CVS) or amniocentesis check for genetic conditions after you're already pregnant naturally.
Adoption: For some families, this feels like the right path altogether, outside of biological conception.
Choosing not to test at all: Some people simply prefer to let nature take its course. This is a completely valid choice too, not a lesser one.

None of these is automatically the "better" choice. What matters most is which one fits your own values and comfort level.

Are There Any Downsides to Know?

Yes, a few honest things worth understanding before you decide:

It only checks for what you're testing for: PGT-M looks specifically at the one known condition in your family. It doesn't check for every possible genetic issue out there.
The biopsy has a very small risk: Removing a few cells from an embryo carries a tiny theoretical risk to it, though modern methods have made this risk quite low.
Not every cycle gives you a healthy embryo: Depending on how the condition is inherited, and how many embryos are made, there's no guarantee every cycle will produce one that's usable and unaffected. Sometimes you may need to try again.
There's a real emotional weight to this: For many families, this process means embryos with the condition typically don't get used. This can feel heavy for some, and that's completely understandable. Taking time, and getting proper support, really helps here.

When Should You Think About This?

It's worth having a conversation with a fertility specialist or a genetic counsellor if any of these apply to you:

A serious genetic condition runs in your or your partner's family
You or your partner already knows about a genetic mutation that could be passed down
You've had three or more failed IVF cycles without a clear reason why
You're 35 or older and starting to think about fertility treatment
You've had recurrent miscarriage or pregnancy loss before
A past pregnancy was affected by a chromosomal condition

What Does This Actually Cost and Involve?

Genetic testing adds a bit of extra time and cost on top of a regular IVF cycle. That's because each embryo needs proper lab analysis before a transfer can happen. The exact cost depends on the specific condition being tested and which clinic you go with, so it's always worth asking for a clear price estimate upfront.

Here's something useful to know. Setting up the test itself can take some time, since a special genetic "probe" often needs to be custom-built for your family's exact gene variant, before testing on embryos can even begin. So starting this conversation early, before you even begin IVF, makes the whole process go smoother. It can even help support a better overall IVF success rate too, simply because it avoids rushed, last-minute decisions during the cycle.

The Emotional Side Deserves Space, Too

Finding out a genetic condition runs in your family, and then having to make big decisions about future children because of it, is genuinely a lot to carry. It's completely normal to feel anxious, sad, guilty, or even relieved once you find a clear path forward. None of these feelings are wrong.

Most clinics offering this kind of testing will connect you with genetic counselling as a regular part of the process. Please don't skip this. A good genetic counsellor can walk you through exactly how the condition gets passed on, what your real risk actually looks like, and what each option truly means for your specific situation, far beyond what any single article, including this one, can cover.

Frequently Asked Questions

No. It significantly lowers the risk of passing on the specific condition you're testing for. But it doesn't guarantee a baby free of every possible health issue, since only the known, targeted genetic problem is being checked.

This article is general information and does not replace individual medical advice. Please discuss your own situation with a qualified doctor.

Last updated: 9/11/2026

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