A sperm count is only one part of a semen analysis. Learn what normal reference limits mean, how asthenospermia and teratozoospermia are assessed, and when to see a fertility specialist.
A semen analysis is one of the first tests used when a couple has trouble conceiving. Sperm count is only one part of it. The test also looks at how sperm move, how they are shaped and the quality of the semen itself. The World Health Organization (WHO) publishes a standardized laboratory manual (6th edition, 2021) so that laboratories examine and report semen in a consistent way.
Two measurements are often confused:
The WHO manual gives lower reference limits, not a single "normal" number. These are statistical cut-offs based on fertile men whose partners conceived within a year. The lower limit is about 16 million sperm per mL for concentration and 39 million per ejaculate for total number.
A result below these limits does not mean a man cannot father a child, and a result above them does not guarantee pregnancy. Counts vary from one sample to the next and between laboratories. A doctor should interpret your report alongside your history and examination.
Sample preparation affects accuracy. Most laboratories ask for 2–7 days of abstinence and a properly collected sample delivered promptly. Reports from a specialist andrology laboratory are usually the most reliable to interpret.
Asthenospermia (also called asthenozoospermia) means reduced sperm motility. Sperm must swim well to travel through the female reproductive tract and reach the egg. WHO's lower reference limits are roughly 42% total motility and 30% progressive motility.
Motility is never judged alone. Low motility often appears together with a low count or abnormal shape, or when a sample was handled poorly. Possible contributors include:
In many men no single cause is found.
Teratozoospermia means a high proportion of sperm with abnormal morphology, such as differences in the head, midpiece or tail. Under WHO's strict criteria, the lower reference limit for typical forms is about 4%. Every sample contains many irregular sperm, so a low percentage of typical forms is common.
Morphology results depend on the laboratory's staining method and the technician's training. That is why morphology should be read together with count, motility and the clinical picture, never on its own. If you want to look further, a sperm DNA fragmentation test may be considered in selected cases, such as unexplained infertility or repeated treatment failure.
It can, but one abnormal report does not establish infertility. The American Society for Reproductive Medicine (ASRM) describes semen analysis as part of the basic infertility evaluation. A doctor will usually consider:
If treatment is needed, the options depend on the findings. Mild changes may be managed with IUI (intrauterine insemination). More significant sperm problems may call for ICSI or IMSI, where selected sperm are used to fertilize the egg in the laboratory.
When no sperm are found in the ejaculate (azoospermia), doctors assess the cause and may use procedures such as PESA & TESA to retrieve sperm. Age also plays a role in both partners, as explained in does age affect fertility in women and men.
Male fertility depends on several factors, including sperm count, sperm motility, sperm morphology, hormone levels, and overall reproductive health. A semen analysis can help assess these factors and provide useful information about sperm health.
Lifestyle habits such as eating a balanced diet, maintaining a healthy weight, exercising regularly, managing stress, avoiding smoking, and limiting alcohol may support healthy sperm production naturally. Some medical conditions and prolonged heat exposure can also affect sperm quality. If semen results are abnormal or pregnancy has not occurred after trying, a fertility evaluation can help identify possible causes and suitable treatment options.
Consider speaking with a urologist or fertility specialist if:
You can book a consultation with our fertility experts for a personalized assessment.
There is no single number. WHO gives lower reference limits (about 16 million/mL concentration and 39 million total per ejaculate), and results are interpreted in clinical context.
It means fewer sperm are moving effectively (asthenospermia). It may reduce the chance of natural conception, but it is assessed together with the other semen parameters.
It is a high percentage of sperm with abnormal shape. It is interpreted within the full semen analysis, not by itself.
Yes. Sperms are produced continuously, and results can vary with illness, fever, stress, medications, smoking, alcohol, heat exposure and abstinence time. This is why repeat testing is often advised.
When a couple has difficulty conceiving, or when a man has a relevant history such as testicular problems, surgery or infections.
A normal sperm count is only one part of a semen analysis and does not by itself confirm fertility. Motility, morphology, semen volume, medical history and the fertility of both partners may also need to be considered.
Sperm count is assessed through a semen analysis. The report may include sperm concentration, total sperm number, motility, morphology, semen volume and other characteristics.
