Genetic Testing for Fertility: Carrier Screening, Karotyping and Embryo Testing Explained

If you’ve heard the words “genetic testing” during a fertility appointment and felt a little overwhelmed due to uncertainty, the complexity of the concepts or the potential impact on your family, you’re not alone.

There are a lot of terms. A lot of acronyms. And a lot of decisions.

The good news? Some genetic testing in fertility care is optional; other times it’s necessary. And when it’s recommended for any reason, it’s often because it can give you helpful information, not because something is definitely “wrong.”

Let’s walk through it together.

First: Why Does Genetic Testing Matter in Fertility Care?

Genetic testing helps answer important questions like:

• Are we carriers for the same inherited condition?
• Is there a chromosomal reason for miscarriage?
• Can we lower the chance of passing on a known genetic condition?
• How can we choose the healthiest embryo during IVF?

It’s about information. And information gives you options.

Before Treatment: Preconception Genetic Testing

This is testing that happens before pregnancy or early in your fertility workup. These texts help assess the risk of passing inherited conditions to a child.

Carrier Screening (Recommended for Almost Everyone)

This is a simple blood or saliva test that looks for gene changes associated with inherited conditions such as cystic fibrosis or spinal muscular atrophy.

Here’s something important to know:
Most people are carriers for at least one condition. That’s normal.

Being a carrier usually doesn’t affect your own health. It only becomes important if the egg and sperm carry the same recessive condition.

If that happens, your care team may talk with you about options like:

• IVF with genetic testing of embryos
• Donor sperm or donor eggs
• Proceeding naturally with informed planning

Carrier screening is considered optional, but it’s increasingly recommended for anyone planning pregnancy.

Karyotype (Chromosome Analysis)

This test looks at the number and structure of your chromosomes.

It’s not routine for everyone. It’s typically recommended if you’ve experienced:

• Recurrent pregnancy loss
• Severe male factor infertility
• Repeated IVF failure
• A known chromosomal issue in your history

If your doctor suggests this test, it’s usually to look for answers (and not intended to add stress).

During IVF: Genetic Testing of Embryos

If you’re going through IVF, you may hear about PGT. That stands for preimplantation genetic testing.

Let’s break down the types.

PGT-A (Testing for Chromosome Number)

PGT-A checks whether embryos have the correct number of chromosomes before transfer.

It’s often recommended if you:

• Are 35 or older
• Have had recurrent miscarriages
• Have experienced multiple failed IVF cycles

PGT-A can:

• Help select embryos more likely to implant
• Reduce miscarriage risk
• Support single embryo transfer

It’s important to know that PGT-A is optional and part of shared decision-making. It doesn’t guarantee pregnancy, but for some patients, it provides helpful clarity.

PGT-M (Testing for a Specific Genetic Disease)

If the people providing the egg and the sperm carry a known genetic mutation, like a dominant or recessive inherited condition, PGT-M allows embryos to be tested specifically for that condition.

This testing is medically indicated when both partners carry the same recessive condition or when one partner carries a dominant condition.

For families with a known genetic disease, this can be life changing.

PGT-SR (Structural Rearrangements)

If one person has a chromosomal rearrangement (like a balanced translocation), PGT-SR screens embryos for related imbalances.

This is strongly recommended when a structural issue has been identified.

Genetic Testing in Male Factor Infertility

Certain genetic tests are only recommended when semen analysis shows severe abnormalities. These may include:

• Y-chromosome microdeletion testing (checks for missing pieces on the Y chromosome)
• CFTR gene testing (in cases where the tubes that carry sperm, called the vas deferens, fail to develop properly)

Again, these are not routine for everyone but can be used when medically indicated.

What About Cost, Timing and Insurance?

These are real-life concerns.

When choosing genetic testing, your team considers:

• Purpose of testing
• Type of panel (targeted vs. expanded)
• Lab quality and certification
• Turnaround time (especially during IVF cycles)
• Insurance coverage and out-of-pocket costs

Many labs offer:

• At-home testing kits
• Insurance benefit checks
• Genetic counseling support

Always ask about cost before testing. You deserve transparency.

The Most Important Takeaways

Here’s what we want you to remember:

• Most genetic testing is optional.
• Some testing becomes recommended based on your history.
• Being a carrier is common and normal.
• Positive results do not mean you can’t have a healthy pregnancy.
• Genetic counseling is available to help you understand results.

Genetic testing isn’t about creating fear. It’s about creating informed choices.

And at the end of the day, that’s what fertility care is about: giving you knowledge, options and support as you build your family.

If you’re unsure whether genetic testing is right for you, talk with your care team. We’re here to guide you through every step.

Fertility Genetic Testing: Common Questions