Why "Unexplained Infertility" Rarely Means There's No Reason
If you've been told your infertility is "unexplained," I imagine that word has sat uncomfortably with you.
Published: | Reading Time: 6 min read | Author: Georgina Gray
It usually means the standard tests haven't found it yet
If you've been told your infertility is "unexplained," I imagine that word has sat uncomfortably with you. It sounds as though there's genuinely nothing going on and you're simply unlucky. In my experience, that's rarely the full story. "Unexplained" is really a description of the limits of standard testing, not a description of your body.
What standard testing actually covers
A typical fertility workup looks at a few blood markers, hormone levels on specific cycle days, a HyCoSy, a semen analysis, and sometimes a scan of the uterus. These are important, well-validated tests, but they are narrow. They're built to catch a specific set of structural and hormonal problems. That means a huge amount of relevant information sits outside the standard panel entirely: thyroid antibodies when TSH looks normal, vaginal microbiome testing, sperm DNA fragmentation when a semen analysis looks fine, gut health, inflammation, and the pattern of hormones across a full cycle rather than a single day. These are simply not part of the standard workup and can provide the data and information which you need to truly understand your fertility picture.
Where I usually start looking
- Thyroid function, including antibodies, not just TSH on its own
- Full-cycle hormone tracking rather than a single day-3 or day-21 blood draw
- Microbiome testing: vaginal, seminal, uterine and gut
- Gut health and inflammation markers, given their influence on hormone metabolism and implantation
- Sperm DNA fragmentation, particularly where a standard semen analysis looked normal
- Core nutrient status: vitamin D, iron, B12, and others relevant to hormone production
Why this matters beyond just "finding an answer"
There's a real emotional weight to being told there's no reason, because it removes any sense of a next step. Widening the investigation isn't about chasing a diagnosis for its own sake. It's about giving you something concrete to work with, whether that's correcting a nutrient deficiency, addressing insulin resistance, or supporting gut health, rather than continuing to try month after month with no clearer picture of what might help.
If you've been told your fertility is unexplained, that's often the point where a functional workup is most useful, not a sign there's nothing left to look at.
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