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A low sperm count, also called oligozoospermia, is where a man has fewer than 15 million sperm per millilitre of semen.
Having a low sperm count can make it more difficult to conceive naturally, although successful pregnancies can still occur.
Problems with sperm, including a low sperm count and problems with sperm quality, are quite common. They're a factor in around one in three couples who are struggling to get pregnant.
There are treatments available on the NHS or privately that can help you become a dad if you have a low sperm count.
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See your GP if you have not managed to conceive after one year of trying for a baby.
It's a good idea for both you and your partner to get advice, as fertility problems can affect men and women and often it's a combination of both. It's important to understand what the exact issue is before you decide on your next steps.
One of the tests your GP can arrange is a semen analysis.
This is where a sample of your semen is analysed in a laboratory to check the quality and quantity of the sperm. The results are usually available within a week.
If the results are abnormal, the test should be repeated to ensure it was accurate. This will normally be performed after three months.
Your GP can refer you to a specialist in male infertility at your local hospital or fertility clinic if any problems are found.
There are several male fertility home-testing kits available to buy from pharmacies. These tests claim to indicate whether your sperm count is low.
It may be tempting to try one of the tests if you would rather not see your GP, but you should be aware that:
While these tests might sometimes give a useful indication of your sperm count, they may also give you false reassurance or may suggest your sperm count is low when it's actually perfectly normal.
It's better to see your GP for a proper semen analysis at an accredited laboratory if you're concerned about your fertility. See how to use self-test kits safely for more about the issues of home-testing.
In many cases, it's not obvious what causes a low sperm count.
Sometimes problems with sperm count and quality are associated with:
If you or your partner has been diagnosed with a low sperm count, there are several options available.
Your doctor may initially suggest trying to conceive naturally for a little longer. Many couples conceive within the second year of trying.
You can help maximise your chances of conceiving by:
Read more about how to improve your chances of becoming a dad.
In vitro fertilisation (IVF) may be an option if you have a slightly low sperm count and you've been trying to conceive naturally with your partner for at least two years.
During IVF, an egg is removed from the woman's ovaries and fertilised with sperm in a laboratory. The fertilised egg is then returned to the woman's womb to grow and develop.
Read more about IVF.
Intracytoplasmic sperm injection (ICSI) is a type of IVF technique, in which a single sperm is injected directly into an egg to fertilise it. The fertilised egg is then transferred to the woman's womb.
ICSI may be offered if you've been trying to conceive naturally with your partner for at least two years and you have either:
Before having ICSI, you and your partner will need to have an assessment to ensure the treatment is appropriate.
This will involve questions about your medical and sexual history, and screening tests to check for infections or genetic problems that could affect your baby and the chances of ICSI working.
The Human Fertilisation & Embryo Authority (HFEA) has more information about ICSI.
Donor insemination means using sperm donated by another man.
You may wish to consider using donor insemination as an alternative to ICSI, particularly if the man has a genetic disorder that could be passed on to any children. It can be used as part of IVF if necessary.
If you're considering donor insemination, you should be offered counselling as a couple about the implications for you and your children.
Read more about what you need to know about using a sperm donor.
If you have very low levels of gonadotrophin hormones (which stimulate the production of sperm), you should be offered treatment with gonadotrophin medication to improve your fertility.
But if no cause has been found for your abnormal sperm count, you will not be offered hormone-based medicines as they are not known to improve fertility in these cases.