You’ve done all the tests. The semen analysis is fine. Both tubes are open. The hormones look normal. The uterus looks healthy. And yet, month after month, nothing. No pregnancy, no miscarriage, just  nothing.

This is called unexplained infertility, and it affects roughly 10 to 15 percent of couples. It is one of the most frustrating diagnoses to receive, precisely because there’s no specific target to fix. But it does not mean there’s no hope. Far from it.

What ‘unexplained’ really means

It doesn’t mean nothing is wrong. It means standard tests haven’t found what’s wrong. The issue might be subtle  microscopic sperm-egg interaction problems that don’t show up on a basic semen analysis, minor egg quality issues that look fine on scans, endometriosis that’s not visible without surgery, or the uterine lining being receptive at a slightly different time than assumed.

Medicine doesn’t have perfect visibility into everything that happens during conception. Unexplained infertility is partly a reflection of the current limits of testing  not a statement that everything is actually fine.

How we approach it at Vedansha Hospital

For couples with unexplained infertility, we work through a structured progression. We start with timed intercourse based on precise ovulation monitoring. If that doesn’t work over a few cycles, we add ovulation induction with tablets. Next step is IUI  placing washed, prepared sperm directly into the uterus at the right moment. And if none of these succeed, IVF becomes the clear next option.

We also look at things beyond the standard tests: sperm DNA fragmentation, endometrial receptivity, and the uterine microbiome  because in unexplained infertility, these subtler factors are sometimes the missing piece.

Why IVF often works even without a diagnosis

This surprises people. If we don’t know what’s wrong, how does IVF help? The answer is that IVF bypasses many of the natural steps that might be silently failing. Fertilisation in the lab removes the uncertainty of sperm-egg meeting. Direct embryo transfer to the uterus skips whatever might be going wrong in the journey through the tubes.

Many couples with unexplained infertility conceive on the first or second IVF attempt. The cumulative success rate over two to three IVF cycles in this group is often 60 to 70 percent in younger women.

The emotional side of an unexplained diagnosis

In some ways, not having an answer is harder than having one. When there’s a diagnosis, you have something to fight. When everything looks ‘normal,’ the confusion and self-doubt can be overwhelming. People wonder if they’re doing something wrong, if they waited too long, if it’s somehow their fault.

It isn’t. Unexplained infertility is not caused by stress, by timing, or by anything you did or didn’t do. It’s a medical situation without a clear label  and it responds to medical treatment.

When to come in

If you’re under 35 and have been trying for a year, or over 35 and trying for six months, it’s time for a full evaluation. At Vedansha Hospital, our fertility specialists will work through everything methodically  and go deeper than standard tests when the standard tests don’t give answers.

Because sometimes the path to pregnancy isn’t about finding the exact problem. It’s about finding the right solution anyway.