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Unexplained Infertility & Genetic Factors

Being told that all your fertility tests are “normal” can be both reassuring and frustrating. For many individuals and couples, one of the most difficult fertility diagnoses to understand is unexplained infertility – a situation where pregnancy has not occurred despite no obvious cause being identified through standard fertility investigations.

While fertility medicine has advanced significantly, not every fertility challenge can be explained by routine testing alone. In some cases, subtle egg quality issues, sperm factors, embryo development problems, implantation challenges, or genetic factors may contribute to difficulty conceiving, even when initial investigations appear normal.

With Dr Daniel Lantsberg, unexplained infertility is approached with careful assessment, personalised treatment planning, and a commitment to understanding the factors that may be affecting your chances of pregnancy.

What is Unexplained Infertility?

Unexplained infertility is diagnosed when standard fertility investigations fail to identify a clear cause for difficulty conceiving.

Typically, this means:

  • Ovulation appears normal 
  • Fallopian tubes are open 
  • The uterus appears normal 
  • Semen analysis results are within expected ranges 
  • No obvious fertility condition has been identified 

Despite these findings, pregnancy has not occurred within an expected timeframe.

Unexplained infertility is more common than many people realise and may account for up to 15–30% of fertility presentations.

Importantly, unexplained infertility does not mean that nothing is wrong. Rather, it means that current testing has not identified a definitive cause.

Why Can Infertility Remain Unexplained?

Successful pregnancy requires a complex series of biological events to occur perfectly.

This includes:

  • Development of a healthy egg 
  • Production of healthy sperm 
  • Fertilisation 
  • Early embryo development 
  • Embryo implantation 
  • Ongoing embryo growth 

Standard fertility tests provide valuable information, but they cannot assess every aspect of reproductive function.

As a result, some fertility challenges may involve factors that are difficult to detect using routine investigations.

Potential Hidden Causes of Unexplained Infertility

There are several reasons why fertility challenges may remain unexplained despite apparently normal test results.

Egg quality plays a critical role in fertilisation, embryo development, and pregnancy success.

While ovarian reserve testing can estimate egg quantity, there is currently no direct test that accurately measures egg quality.

Age-related changes in egg quality may contribute to unexplained infertility even when other fertility tests appear normal.

Standard semen analysis evaluates:

  • Sperm count 
  • Sperm movement 
  • Sperm shape 

However, sperm quality extends beyond these measurements.

Factors such as sperm DNA fragmentation may affect:

  • Fertilisation 
  • Embryo development 
  • Implantation 
  • Miscarriage risk 

In some situations, additional male fertility assessment may be appropriate.

Fertilisation may occur normally, yet embryos may not develop as expected.

Some embryos stop developing before reaching the stage required for successful implantation.

These developmental challenges are often impossible to identify without IVF treatment and embryo culture.

Successful implantation depends on complex interactions between the embryo and the uterine lining.

In some patients, subtle implantation-related factors may contribute to difficulty conceiving despite otherwise normal investigations.

Mild endometriosis may occasionally be present despite limited symptoms and normal imaging.

Even relatively mild disease may affect:

  • Egg quality 
  • Pelvic inflammation 
  • Embryo development 
  • Implantation 

Could Genetic Factors be Contributing?

In some patients, genetic factors may contribute to infertility, recurrent miscarriage, failed embryo development, or difficulty achieving a successful pregnancy.

Genetic factors are often invisible during routine fertility investigations and may only become apparent after more detailed assessment.

Human eggs and sperm contain genetic material that must combine correctly to create a healthy embryo.

As women age, the risk of chromosomal abnormalities within eggs increases.

Chromosomal abnormalities may contribute to:

  • Difficulty conceiving 
  • Failed implantation 
  • Recurrent miscarriage 
  • Reduced IVF success rates 

Some individuals carry genetic variations that may affect reproductive outcomes.

In selected situations, carrier screening may be recommended to identify inherited genetic conditions that could impact future children.

For some couples experiencing recurrent pregnancy loss, chromosomal rearrangements or genetic factors may contribute to miscarriage risk.

Genetic testing may sometimes help identify underlying causes and guide treatment planning.

Genetic testing is not necessary for every patient.

However, it may be considered in situations involving:

  • Recurrent miscarriage 
  • Repeated IVF failure 
  • Known family history of genetic conditions 
  • Severe male infertility 
  • Advanced maternal age 
  • Previous abnormal pregnancy outcomes 

Dr Daniel Lantsberg provides personalised advice regarding whether genetic testing may be appropriate based on your individual circumstances.

How is Unexplained Infertility Assessed?

A thorough fertility assessment may include:

  • Hormone testing 
  • Ovarian reserve assessment 
  • Ultrasound imaging 
  • Semen analysis 
  • Ovulation assessment 
  • Review of medical history 
  • Assessment of previous fertility treatment 

Additional investigations may be recommended depending on your circumstances and reproductive history.

The goal is to identify any potentially contributing factors while avoiding unnecessary testing.

Treatment Options for Unexplained Infertility

Treatment depends on age, fertility history, duration of infertility, and individual circumstances.

For some younger couples with a shorter duration of infertility, continued attempts at natural conception may be appropriate.

This decision is guided by age, fertility testing, and pregnancy goals.

Some patients may benefit from treatment designed to optimise ovulation timing and improve opportunities for conception.

Even when ovulation appears normal, carefully monitored treatment may improve pregnancy rates in selected situations.

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IUI may be considered for selected patients with unexplained infertility.

Treatment involves placing prepared sperm directly into the uterus around ovulation, helping maximise the opportunity for fertilisation.

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IVF is often one of the most effective treatments for unexplained infertility.

In addition to improving pregnancy chances, IVF can provide valuable information regarding:

  • Egg quality 
  • Fertilisation 
  • Embryo development 
  • Embryo viability 

This additional insight can sometimes reveal factors that are not visible through routine fertility investigations.

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For selected patients, advanced testing and treatment strategies may be considered.

This may include:

  • Carrier screening 
  • Embryo genetic testing 
  • Advanced sperm assessment 
  • Individualised IVF protocols 

Recommendations are based on your fertility history, age, reproductive goals, and previous treatment outcomes.

A Personalised Approach to Unexplained Infertility

One of the greatest frustrations of unexplained infertility is the uncertainty it creates.

With Dr Daniel Lantsberg, treatment is never based on assumptions or a one-size-fits-all approach. Care begins with a detailed review of your fertility history, investigations, and goals, allowing treatment recommendations to be tailored to your individual circumstances.

The focus is not simply on identifying a diagnosis, but on developing the most effective pathway towards achieving pregnancy.

Why Choose Dr Daniel Lantsberg

Dr Daniel Lantsberg is a highly experienced Melbourne fertility specialist with over a decade dedicated exclusively to fertility medicine. He combines advanced subspecialist training, international experience, and academic leadership with a genuinely personalised approach to care.

  • 10+ years in fertility medicine — 3,000+ IVF cycles, 2,000+ babies
  • Sub-specialist fellowship trained in reproductive endocrinology and infertility
  • Clinical Director at Melbourne IVF and Senior Lecturer at the University of Melbourne
  • Featured fertility specialist on Channel Nine's Big Miracles
  • Longer consultations, fewer patients, fully tailored treatment plans

Take the First Step

Being told your fertility is “unexplained” can feel frustrating and overwhelming, but it does not mean that effective treatment options do not exist.

Many individuals and couples with unexplained infertility go on to achieve successful pregnancies with the right assessment, treatment strategy, and support.

To discuss your fertility and develop a personalised treatment plan, book a consultation with Dr Daniel Lantsberg.

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