Fertility questions can feel especially personal when someone in your family has experienced difficulty conceiving. You may wonder if infertility is hereditary, or if the same thing could happen to you.
Sometimes, genetics can play a role in fertility. But a family history doesn’t tell us what will happen in your case. Infertility can have many causes, and understanding your health history is one part of working out what may be affecting you.
Here, we explain what genetics can and cannot tell you, when testing may be considered, and how a fertility specialist can help you understand your options.
Can Infertility Be Genetic?
Yes. Certain changes in chromosomes or genes can affect ovulation, egg or sperm production, or the reproductive organs. In some cases, a fertility assessment identifies a genetic condition. In many others, the cause is not clear, or several factors may be involved.
Genetics is an evolving area of reproductive medicine. Researchers have identified specific genetic conditions associated with fertility challenges, but there is no single genetic test that explains every case. Research on the genetics of infertility describes how complex the field is, including the difficulty of identifying a genetic explanation for many patients.
Genetic vs. Hereditary Infertility
These terms are related, but they do not mean exactly the same thing.
A genetic condition involves a change in genes or chromosomes. A hereditary condition is genetic and passed from a biological parent to a child. Some genetic changes are inherited. Others happen for the first time in an individual and may not appear in the family history.
That means a relative’s experience can be helpful context, but it cannot confirm the cause of your fertility concerns. The reverse is also true: not knowing of a family history does not rule out a genetic condition.
Some common conditions, including Polyendocrine Metabolic Ovarian Syndrome (PMOS) and endometriosis, can occur in families. They are complex conditions, though, and usually aren’t explained by a single inherited change. Family history may be one part of the picture, not a prediction of what will happen to you.
Signs That Could Point to Genetic Infertility Conditions
There is no single symptom that proves infertility is genetic. A clinician may consider genetic testing when a person’s medical history, family history, examination, or test results suggest a particular condition.
For example, further assessment may be considered when someone has:
- A known genetic condition or chromosome difference
- A close relative with early menopause or primary ovarian insufficiency
- A family history of a known inherited condition
- Very low sperm count or no sperm in a semen analysis
- Signs of a condition that can affect the reproductive organs or hormone production
- Recurrent pregnancy loss, where a clinician identifies a reason to consider testing
These findings do not automatically mean that a genetic cause is present. They help guide whether a test could provide useful information.
Biological Female Infertility Genetic Causes
Some chromosome differences and gene changes can affect ovarian function. For example, Turner syndrome involves a difference in one X chromosome and can affect ovarian development. A change in the FMR1 gene, associated with fragile X syndrome, may also be relevant when assessing some people for primary ovarian insufficiency.
There can also be genetic contributions to conditions such as PMOS or endometriosis. These conditions are complex, and having a family member with either one does not mean you will necessarily develop it or experience infertility.
A clinician considers genetic testing based on the full picture, including age, menstrual history, hormone results, ultrasound findings, and family history. No one symptom or blood test can confirm genetic infertility on its own.
Genetic Causes of Biological Male Infertility
Genetic conditions can affect sperm production or the movement of sperm through the reproductive tract.
Examples include Klinefelter syndrome, a chromosome condition that can affect testicular development and sperm production, and certain deletions on the Y chromosome that may be associated with very low sperm counts or no sperm in the ejaculate.
Changes in the CFTR gene can be associated with congenital absence of the vas deferens, the tubes that carry sperm. When this is suspected, genetic assessment may be relevant, including discussion of whether a partner should also be tested.
These are examples, not a complete list. A semen analysis and medical assessment help determine whether to consider genetic testing.
Other Reasons for Infertility
Genetic factors are only one possible part of fertility. Many patients have other causes, a combination of factors, or no identified cause after assessment.
Hormone Disorders and Ovulation Problems
Conditions that affect hormones or ovulation, including PMOS and thyroid disorders, can make it harder to conceive. These conditions are not always genetic, and their assessment and treatment depend on the individual.
Endometriosis, Tubal, or Uterine Factors
Endometriosis, blocked fallopian tubes, fibroids, or differences in the shape of the uterus can affect fertility. Some uterine differences are present from birth, while other conditions develop later. Assessment helps determine whether a finding is affecting your ability to conceive.
Age-Related Fertility Changes
Fertility changes with age. These changes are not the same as an inherited genetic condition, though chromosomes are involved in egg and embryo development. A clinician can explain how age fits into your individual assessment.
Unexplained Infertility
Sometimes initial testing does not identify a clear cause. “Unexplained infertility” does not mean there is no reason or that the difficulty is imagined. It means that standard assessment has not found an explanation. Your care team can discuss what this means for next steps.
Genetic Testing for Infertility
Genetic testing is not a routine test for everyone experiencing infertility. If recommended, the type of test depends on the clinical question. It may involve a blood test to examine chromosomes or testing for a specific gene change. In some cases, a genetic counsellor can help explain the test, its limits, and what a result could mean for you and your family.
Carrier screening is different from testing to find the cause of infertility. It looks for certain inherited conditions that could be passed to a child. It does not assess every genetic condition or explain every fertility concern.
Embryo genetic testing is also different from testing a patient’s genes. It may be discussed in particular IVF situations, but it is not a universal solution for infertility. Your specialist can explain when testing may or may not be useful.
Options & Support for Patients With Genetic Infertility
A genetic finding does not automatically determine whether you can become a parent or which treatment is right for you. Options depend on the specific condition and your goals. They may include treatment for an associated health issue, fertility treatment, or a discussion of donor eggs or sperm. Genetic counselling may help you understand the chance of passing a particular condition to a child.
A clear conversation with your care team can help separate what is known from what is still uncertain. You do not need to make every decision at once.
Talk to TRIO About Infertility
If you are having difficulty conceiving, or have questions about infertility in your family, a fertility assessment can help identify what to investigate. TRIO’s team can review your history, explain appropriate testing, and discuss possible next steps with you.
Talk to our TRIO Care Navigator to learn how to get started.
