Unexplained subfertility means that a couple has been trying to conceive for at least a year, all standard tests in both partners look normal, and still no pregnancy occurs. It affects up to a quarter of couples with fertility problems. “Unexplained” does not mean nothing is going on: it means the standard tests cannot pinpoint the cause, which often lies in subtle factors such as sperm DNA quality, inflammation, the microbiome or stress.
Hearing that everything is “normal” can feel just as heavy as a clear diagnosis, or even heavier. At Mesology Amsterdam I work specifically with men in this situation, looking beyond the standard numbers at the whole system. Read more about Fertilidad masculina.
Principales conclusiones
- Unexplained subfertility means normal standard tests in both partners, but no pregnancy after a year of trying.
- A semen analysis measures count, movement and shape, but not sperm DNA damage or inflammation.
- Hidden factors include oxidative stress, hormone balance, the microbiome, nutrition and chronic stress.
- An integrative approach looks at the whole man, alongside the care of your GP or fertility clinic.
- Changes in sperm quality take about three months, the time sperm cells need to develop.
~ What does unexplained subfertility mean?
Doctors speak of unexplained subfertility when:
- una pareja ha estado intentando concebir durante un año o más,
- basic investigations in both partners show no clear abnormalities,
- ovulation and the timing of intercourse are fine,
- and no concrete medical cause can be found.
This does not mean nothing is wrong. It means that with the current standard tests, the underlying reasons cannot be found yet. Often there are subtle imbalances at several levels that together make the difference between “it should work” and “it still does not”.
How common is it?
Depending on the definition, unexplained subfertility is found in about 15 to 30 percent of couples who are investigated for fertility problems. In the Netherlands, the usual advice is often to keep trying for a while longer, followed by IUI or IVF.
~ What a standard semen analysis does not show
A semen analysis measures the number of sperm cells, how well they move and their shape. That is valuable, but it says little or nothing about:
- DNA damage and the epigenetic quality of sperm
- subtle hormonal imbalances within the normal range
- low-grade inflammation or immune activity
- the gut and semen microbiome
- stress resilience and the balance of the nervous system
- nutritional status, toxic burden and micronutrient shortages
So you can have “normal” semen values on paper and still not be in the best condition to conceive and support a healthy pregnancy. A sperm DNA fragmentation test, which some clinics offer, can add useful information in unexplained subfertility.
~ 6 hidden factors in unexplained subfertility in men
1. Oxidative stress and sperm DNA
An excess of free radicals can damage sperm DNA without changing the count or movement. Smoking, alcohol, excess weight, infections and a diet low in antioxidants all increase oxidative stress.
2. Digestion and metabolism
How well you digest and absorb food determines the building blocks available for hormones and sperm. Bloating, reflux or energy dips after meals can be signs that this needs attention.
3. Liver function
The liver is central to hormone metabolism, processing fats and clearing environmental substances. When it is overloaded, hormone balance and inflammation can be affected.
4. Gut health and the microbiome
A disturbed gut flora can influence immunity, hormones and inflammation, and the microbiome of the reproductive tract also plays a role in sperm quality.
5. Hormones as a system
Beyond testosterone, the thyroid, adrenal glands and the hormonal control centre in the brain all play a role. Subtle imbalances may stay within the normal ranges but still show up in symptoms.
6. Stress and recovery
Chronic stress affects the hormones that drive sperm production, as well as sleep and recovery. The mental and emotional strain of a fertility journey is part of this picture.
~ How mesology looks at unexplained subfertility
Mesology starts from the idea that fertility reflects the overall state of the body: digestion, hormones, nervous system, immune function, mind and environment, not just the reproductive organs.
Besides regular medical knowledge, I use insights from Traditional Chinese Medicine and Ayurveda. Concepts such as kidney energy, digestive fire and stagnation help to understand how your constitution and energy relate to your reproductive strength. Combining these layers gives a much richer, more personal picture of unexplained subfertility than semen numbers alone.
~ What a trajectory for unexplained subfertility looks like
1. Intake: your story comes first
In a 90-minute first consultation we explore your and your partner’s fertility story, the medical tests so far, physical complaints (also those that seem unrelated), digestion, energy, sleep, mood, libido, stress, diet and lifestyle. If you already have test results, we include them.
2. Evaluación mesológica
With physical measurements, including testing at acupuncture points, and clinical assessment, I map which organs, systems and regulatory processes are under strain. You are not “the man with normal results”, but a whole person.
3. Plan de tratamiento personal
You receive a plan that may include anti-inflammatory and microbiome-friendly nutrition, lifestyle changes for movement, sleep and workload, supplements or herbal support where useful, support for liver and digestion, and stress regulation that fits your life. Whenever possible, the plan is coordinated with your GP or fertility clinic.
4. Follow-up and adjustment
In follow-up consultations we look at how you feel, how your energy and symptoms change and, if available, whether semen or blood results shift. We adjust the plan and align it with any IUI, IVF or ICSI trajectory. Read more about IVF and IUI support.
~ Who is this approach for?
An integrative approach to unexplained subfertility can be especially suitable if:
- Sus resultados de los análisis son “normales”, pero no se produce embarazo
- sentir que algo no está bien en tu energía, la digestión, el nivel de estrés o la salud en general
- you want to do more than wait and go through medical procedures passively
- Estás interesado en una visión holística y a la vez fundamentada de tu fertilidad
For practical lifestyle steps you can start today, read how lifestyle affects sperm quality.
Reserva tu primera cita
¿Se reconoce en la infertilidad inexplicable y quiere entender qué podría estar sucediendo bajo la superficie?
Book an integrative fertility consultation at Mesology Amsterdam for a whole-person assessment of your male fertility.
Qué puedes esperar de una primera sesión
90 minutos, en mi consulta en Ámsterdam. Cartografío tu historia clínica, reviso tus pruebas y resultados anteriores y realizo una evaluación de pulso, lengua y EPD. Dejas con un plan claro y escrito, en inglés, español o holandés.
Frecuentemente ~
Preguntas frecuentes
Preguntas ~
It means a couple has been trying to conceive for at least a year, the man’s semen analysis and the standard tests in both partners are normal, and no medical cause for the lack of pregnancy can be found.
Yes. A standard semen analysis does not measure sperm DNA damage, oxidative stress, inflammation or subtle hormone imbalances, which can all affect fertility while the numbers look normal.
A sperm DNA fragmentation test, a broader hormone panel (including thyroid) and checks of vitamin D and other nutrients can add information. Discuss these options with your GP or fertility clinic.
Often they can. Stopping smoking, reducing alcohol, eating more antioxidant-rich food, managing stress and improving sleep support sperm quality. The effect shows after about three months.
No. Mesology is complementary. It works alongside your GP or fertility clinic, and all prescribed treatments and medication stay as they are.
Most men start with a 90-minute intake followed by 2 to 3 follow-up consultations over about three to six months, in line with the time sperm cells need to develop.
Referencias
- Cleveland Clinic: Unexplained Infertility
- NICE guideline CG156: Fertility problems: assessment and treatment.
- World Health Organization (2021). WHO laboratory manual for the examination and processing of human semen, 6th edition.
- Agarwal A. et al. (2020). Sperm DNA fragmentation: a new guideline for clinicians. The World Journal of Men’s Health.
- Smits R.M. et al. (2019). Antioxidants for male subfertility. Cochrane Database of Systematic Reviews.
