What does "unexplained infertility" mean?
Unexplained infertility is the diagnosis given when you haven't conceived after a year or more of trying, but standard investigations haven't found a clear cause. It's common, and it's thought to affect around a quarter of couples who go through fertility investigations.
Standard NHS investigations usually cover:
- Ovulation, usually checked with a progesterone blood test in the second half of your cycle
- Whether the fallopian tubes are open
- A semen analysis
Those are the right places to start. But they don't look at everything, and a "normal" result isn't always the whole picture. That doesn't mean everyone needs more tests. It means it's worth asking which gaps might matter in your situation.

