Infertility affects 1 in 7 couples with 25% being unexplained infertility. However 1 in 3 causes of infertility are due to known male factors. The most common cause of male infertility is poor quality semen.
Initially male infertility investigations involve a semen analysis and possibly subsequent tests including genetic blood tests, hormone blood tests, sperm DNA fragmentation test and semen culture. This will give a clear picture of the sperm quality.
There are several causes of abnormal semen which include:
Testicles produce sperm, if they're damaged it can seriously affect the quality of semen. This can happen due to:
Ejaculation problems can make it difficult to release semen during sex. Hypergonadism is having abnormally low levels of testosterone (male sex hormone involved in making sperm). It can be caused by a tumour, taking illegal drugs or Klinefelter Syndrome (a rare condition where a man is born with an extra female chromosome).