Unexplained infertility: What comes next?

You’ve done the semen analysis, the hormone panels, and the pelvic scan. Everything looks normal — and yet pregnancy hasn’t happened. Your doctor writes “unexplained infertility” in your file and, for many couples, that phrase lands harder than a clear diagnosis would. At least a diagnosis points somewhere. This article explains what “unexplained” actually means, what further investigations are available in South Africa, and what the evidence says about your realistic next steps.

What “unexplained” actually means

Unexplained infertility is not a diagnosis of exclusion in the dismissive sense. It means that standard first-line investigations — semen analysis, ovulation confirmation (typically via mid-luteal progesterone), and at least one open fallopian tube confirmed by hysterosalpingography (HSG) — have returned normal results, yet conception has not occurred after 12 months of regular unprotected intercourse (or six months if the woman is over 35).

Globally, roughly one in four couples undergoing fertility investigation receives this label. No local South African prevalence figure has been published by SAMRC or the Department of Health, so the international estimate is the best available benchmark.

The frustrating reality is that “unexplained” often means “undetected with standard tools.” Several mechanisms — subtle egg quality issues, sperm DNA fragmentation, immunological factors, or early embryo implantation failure — are not picked up by routine testing. This is where second-tier investigations come in.

The scare you may have read about: does “unexplained” mean nothing is wrong?

Media coverage of fertility tends toward two extremes: miracle IVF stories and alarming “infertility epidemic” headlines. Neither helps couples in the middle. A 2023 review in Human Reproduction Update (no SA equivalent exists for this specific meta-analysis) confirmed that couples with unexplained infertility who receive no treatment still conceive naturally at rates of around 13–17 per 100 couples per year, depending on the woman’s age and duration of infertility. That is a real, meaningful chance — but it declines significantly after three years of trying, and after age 37 the annual natural conception rate drops below 10 per 100 couples. Waiting indefinitely is a strategy, but it carries a real cost in time.

Second-tier investigations worth knowing about

Your gynaecologist or fertility specialist may recommend one or more of the following if standard tests have come back normal.

Laparoscopy can identify endometriosis or pelvic adhesions that HSG misses. The South African Society of Obstetricians and Gynaecologists (SASOG) notes that endometriosis is significantly underdiagnosed in SA, partly because symptoms are normalised and partly because laparoscopy requires theatre time that is scarce in the public sector. Mild endometriosis may not show on ultrasound at all.

Sperm DNA fragmentation testing measures damage to the genetic material inside sperm. Standard semen analysis can show normal motility and morphology even when fragmentation is high. A fragmentation index above 25% is associated with lower natural conception rates and poorer IVF outcomes, though no SA-specific threshold data exists — this figure comes from the European Society of Human Reproduction and Embryology (ESHRE).

Advanced hormone panels including anti-Müllerian hormone (AMH) give a fuller picture of ovarian reserve than a standard day-3 FSH alone. AMH does not predict natural conception directly, but it informs how a woman is likely to respond to ovarian stimulation if treatment is needed.

Endometrial receptivity testing (such as the ERA test) looks at whether the uterine lining is receptive at the time embryo transfer would typically occur. It remains investigational and expensive, and ESHRE’s 2023 guidelines note that evidence for routine use is still insufficient. Mention it to your specialist, but approach it with realistic expectations.

Getting help in SA’s public and private systems

Access to fertility care in South Africa reflects the same public-private divide that shapes all specialist healthcare here.

Public sector: Fertility investigations and treatment in the public sector are possible but limited. District hospitals handle basic gynaecology; referrals for specialist fertility work go to academic hospitals — Chris Hani Baragwanath, Groote Schuur, Tygerberg, and Steve Biko Academic Hospital among them. Waiting lists for laparoscopy or assisted reproduction can run to months or years. Importantly, HIV-positive couples face additional administrative requirements before accessing assisted reproduction in the public system, though South Africa’s guidelines have progressively expanded access. For most public-sector patients, IVF is not realistically available without moving to the private sector.

Private sector costs (2025 estimates): A consultation with a reproductive medicine specialist runs roughly R1,500–R2,500. Sperm DNA fragmentation testing costs approximately R1,800–R2,500 depending on the laboratory. A diagnostic laparoscopy in a private facility costs R15,000–R35,000 all-in (surgeon, anaesthetist, theatre). One full IVF cycle — stimulation drugs, egg retrieval, fertilisation, and one fresh transfer — typically costs R45,000–R80,000, with medication adding R10,000–R25,000 on top. Frozen embryo transfer cycles cost less, usually R15,000–R25,000 per cycle.

Medical aid and PMBs: Infertility treatment is not a Prescribed Minimum Benefit (PMB) condition under the Medical Schemes Act, which means your medical aid is not legally required to cover IVF or fertility drugs. Some open schemes and hospital plans do offer fertility benefits as an add-on, typically capped at one or two cycles per lifetime benefit or a rand limit of R50,000–R75,000. Check your benefit schedule carefully — the word “fertility” may be buried under “maternity” or “specialist” categories. Sperm DNA testing and laparoscopy for a diagnosed gynaecological reason (such as confirmed endometriosis) may qualify under different benefit codes; ask your specialist’s billing team to motivate correctly.

Practical barriers: Load-shedding affects fertility clinics that store embryos and hormone-sensitive medications — ask your clinic about their backup power and cold-chain protocols before committing to a cycle. Transport costs to a specialist in a major centre add up quickly for patients outside Johannesburg, Cape Town, Durban, or Pretoria; telephonic follow-up consultations, now widely available post-COVID, can reduce the number of in-person trips needed.

What treatment evidence actually supports

For couples with unexplained infertility, three treatment paths have the strongest evidence base.

Ovulation induction with intrauterine insemination (IUI): ESHRE’s 2023 unexplained infertility guideline found that three to four cycles of ovarian stimulation combined with IUI produce cumulative pregnancy rates of 30–40% — roughly double the unassisted rate over the same period. Each IUI cycle in private care costs approximately R4,000–R8,000, making it a meaningful step before IVF.

IVF: For couples who have not conceived after three to six IUI cycles, or where the woman is over 37, moving to IVF is supported by evidence. IVF also provides information — fertilisation rates and embryo quality tell you things no blood test can. The Heart and Stroke Foundation SA does not publish fertility data, but the SAMRC’s Burden of Disease data does confirm that age-related fertility decline in South African women mirrors global patterns.

Expectant management with lifestyle optimisation: For younger couples (woman under 35, infertility duration under two years), a structured three to six month period of lifestyle review — sleep, physical activity, reducing alcohol, managing weight without shame-based framing — combined with continued trying, is a reasonable choice. No supplement has sufficient evidence to be routinely recommended; CoQ10 and DHEA are sometimes discussed but ESHRE rates the evidence as low quality.

When to see a specialist

See a reproductive medicine specialist (not just a general gynaecologist) if:

– You’ve had an unexplained infertility diagnosis for more than six months with no further investigation plan

– The woman is 35 or older — don’t wait 12 months; consult at six months of trying

– You’ve had two or more pregnancy losses alongside the unexplained diagnosis

– You’ve completed three IUI cycles without success

– Either partner has a known comorbidity (HIV, diabetes, or a history of TB affecting the pelvis or reproductive tract) that may complicate standard treatment paths

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In the public sector, ask your GP or clinic sister for a referral letter to the nearest academic hospital’s obstetrics and gynaecology department.

The emotional weight is real — and treatable

Unexplained infertility carries a specific psychological burden: the absence of a reason makes it harder to grieve or plan. A 2022 study in Fertility and Sterility (no SA equivalent) found that couples with unexplained infertility reported higher anxiety scores than couples with a specific diagnosis, possibly because uncertainty prolongs the decision loop. SADAG (South African Depression and Anxiety Group) offers support at 0800 567 567 (toll-free). Several fertility clinics in SA include counselling as part of their protocols — ask whether this is included in your treatment quote or billed separately.

Bottom line

• Ask for second-tier tests — laparoscopy and sperm DNA fragmentation testing in particular — before accepting that nothing further can be investigated.
• Check your medical aid benefit schedule for fertility add-ons; IVF is not a PMB but laparoscopy for endometriosis may be covered under a different code.
• Three to four IUI cycles before IVF is a cost-effective, evidence-supported sequence for most couples under 37.
• Age matters more than most other variables — if the woman is 35 or older, escalate the investigation timeline rather than waiting.
• Get emotional support early, not as a last resort; call SADAG on 0800 567 567 or ask your clinic about fertility counselling.