His semen analysis came back normal. So why aren't you pregnant?

You have been trying for a while. Maybe a year, maybe longer. Someone suggested he get tested, he did, and the result came back as "normal". Everyone felt relieved for about a day. Then the question came back: if it's normal, why isn't it happening?

I hear this from couples in my clinic all the time, and I want to explain what "normal" does and doesn't tell you.

What a normal result means

A semen analysis counts how many sperm there are, how many are moving, how well they move, and what shape they are. The lab compares those numbers with a set of reference values from the World Health Organization. If he is above the lower limits, the report says normal.

Those limits are not a promise of fertility. They are the bottom of the range seen in men whose partners got pregnant within a year. A man can sit just above the line on every number and still be a long way from his best. Fertility is not a pass or a fail. It is a spectrum, and "normal" covers a very wide stretch of it.

Why one result can mislead you

Sperm numbers change from one sample to the next. A fever, a stressful month, poor sleep, a few weeks of heavy drinking or a long spell of hot baths can all shift the result. Because sperm take about 74 days to make, a sample today reflects what happened to his body roughly three months ago. So one test is a snapshot, and sometimes a blurry one.

What a standard semen analysis can't see

The test looks at sperm under a microscope. It does not tell you:

  • Whether the DNA inside the sperm is intact. Damaged DNA is linked to slower conception and a higher chance of miscarriage, and a standard analysis does not measure it.

  • Whether something upstream is affecting production, such as a varicocele (an enlarged vein in the scrotum), low testosterone or a thyroid problem.

  • How sperm behave once they are inside the body, which no routine test can show.

When all of this is missed, couples are often told they have "unexplained infertility". That is the label doctors use when the standard tests look fine but pregnancy still hasn't happened. It does not mean nothing is going on. It means the usual tests didn't find the reason.

Male factors are part of the picture in about half of couples

We tend to assume that if the man has had a test and it was fine, the focus moves to her. Male factors contribute in about half of couples who struggle to conceive, so a single normal result should not close the conversation.

What you can do next

The good news is that there is a lot you can do, and most of it is within your control. Sperm are made fresh every few months, so changes to his heat exposure, sleep, food, alcohol and a few key nutrients can show up in your next result.

I put everything I would walk a couple through in my clinic into a guide for men called Don't Accept "Fine". It explains how to read your results line by line, what else is worth asking for, what he can change over the next three months and how to bring it up with a GP. It costs £6.99.

Get Don't Accept "Fine" for £6.99

This post is general education and does not replace medical advice.

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