Unexplained infertility is a sentence that feels like a shrug. Clinically it means the standard tests did not find a cause β not that nothing is wrong, and not that you imagined 18 months. The NHS infertility page says that in a quarter of cases it is not possible to identify the cause. Common identified causes on the same page are lack of regular ovulation, poor-quality semen, blocked or damaged tubes, and endometriosis. βUnexplainedβ is what is left when those look normal and you are still not pregnant.
That letter lands hard. The next move is not a fourth investigation sold on a forum.
What βunexplainedβ usually involved testing
There is no mystery blood the NHS forgot. A typical UK work-up looks like this:
- History from both partners, including sex, smears, medicines, smoking, weight, alcohol.
- Mid-luteal progesterone to confirm ovulation (even with regular cycles).
- Semen analysis against WHO values, repeated if the first is abnormal.
- A check of the uterus and tubes β HSG, HyCoSy, or laparoscopy and dye if there are comorbidities such as previous PID or endometriosis.
- Chlamydia screening. Rubella status. Cervical screening if it is due.
UK fertility guidance is as interested in what not to do. Don't use basal body temperature charts to confirm ovulation. Don't routinely measure prolactin unless there is an ovulatory disorder, galactorrhoea or a pituitary tumour. Thyroid function only if there are symptoms of thyroid disease. Don't offer hysteroscopy unless a uterine problem is suspected. AMH is not a predictor of spontaneous conception. Complementary therapies have not been properly evaluated. That list is how people stay βunexplainedβ without being under-investigated.
One 2026 addition: consider coeliac serology in unexplained subfertility. That's a blood test with a guideline behind it, not a gluten-free influencer protocol. If it is offered, take it. If it is not, ask β don't start a six-month elimination diet in lieu of the referral.
What you do next
| NICE fertility guidance | Plain English |
|---|---|
| Try to conceive for a total of 2 years before treatment, if you are having regular unprotected vaginal sex | The GP year and the βexpectant managementβ year can overlap. It is a total, not two extra years after diagnosis |
| Do not offer ovarian stimulation as a stand-alone treatment | Clomifene-for-the-sake-of-it is not the unexplained pathway |
| After 2 years, discuss options: consider up to 4 cycles of IUI with gonadotrophin stimulation before IVF, or offer IVF | Treatment is a discussion, not an automatic private package. Funding is ICB-specific |
If a miscarriage or ectopic happens during expectant management, do not restart the timeframe. Bring that sentence to the appointment. Marie Claire's how-to-get-pregnant piece is fine for timing and prenatal vitamins while you wait. It is not a second opinion on unexplained infertility.
What you can still change without pretending it is a diagnosis
Smoking, BMI 30 or over, BMI under 18.5 with missing periods, excessive alcohol, and some occupations and medicines (GLP-1 agonists, anabolic steroids, some lubricants) still matter when the tests are βnormalβ. Caffeine: there is no consistent evidence of an association with fertility problems β see the caffeine and alcohol note rather than cutting espresso as a personality.
Sex every 2 or 3 days remains the NHS frequency. If timed intercourse has become the entire relationship, say so. Unexplained is allowed to be emotionally violent. It is not a reason to add four untested herbs because the results PDF was blank.
Food supplements in an unexplained year
A preconception formula does not turn unexplained into explained. The honest job is the 90-day window you already have: folic acid 400 Β΅g (or prescribed 5 mg), vitamin D as NHS advises, and one stack instead of six bottles if you want it. Her Fertility and Him Fertility are those stacks. The couple bundle and fertility-support collection exist because unexplained is a couple diagnosis even when her AMH and his count both look βfineβ.
If a private clinic wants DNA fragmentation, NK cells or a thrombophilia panel your NHS team did not, ask which guideline they are following.
FAQ
Does unexplained mean we will never find a reason?
It means today's standard tests did not. Some couples later find endometriosis at laparoscopy, a later abnormal semen sample, or a timing problem that was never the tests' job. Some never get a neater noun. Treatment pathways still exist.
Should we pay for IVF now rather than wait out two years?
That's funding, age, and preference. Guidance discusses IUI with stimulation or IVF after a total of two years of trying. Private care can start sooner. It is still not a reason to skip the basic work-up.
Is a high-dose fertility supplement the missing test?
No. Nutrition can sit beside expectant management. Clinic first.
Unexplained is a real category, not a consolation prize. Keep the UK clocks, both partners, and a 90-day nutrition window if you want one.
How the fertility formulas fit
Unexplained infertility is a clinic category. Optional nutrition in the 90-day window is still the same nutrients this journal already explains: Her Fertility (CoQ10 300 mg, NAC 400 mg, 5-MTHF 400 Β΅g, zinc 20 mg) and Him Fertility (zinc 15 mg, selenium 200 Β΅g, CoQ10 300 mg, ALCAR 250 mg). The couple bundle starts both together. Keep the GP/NICE timeline.
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