Whether it is an active test for preconception preparation or a passive test for fertility problems, a routine semen test is essential, as it is the most basic test to reflect male fertility, just like a routine blood test for your physical examination. Semen routine contains many parameters, including liquefaction time, PH value, sperm concentration, sperm vitality, sperm malformation rate and so on. Today, let’s get to know sperm vitality. Normal sperm are not stationary in semen, but are in constant motion. That is why there is a sperm motility measurement, which reflects to some extent the male fertility. Only well-moving sperm can take the initiative to unite with the egg and complete the final mission of fertilization with the vigor of “running 100 meters”. What is the current normal standard of sperm motility? According to the 4th edition of the WHO semen quality standards, as long as the percentage of spermatozoa of class A is greater than 25% or the total number of spermatozoa of class A and class B is greater than 50%, it is considered normal; according to the 5th edition of the WHO standards, as long as the percentage of forward-moving spermatozoa is greater than 32%, it is considered normal. In my opinion, first of all, it is better that these prescribed percentages should be met; if these percentages are very low, fertility is definitely affected; secondly, the absolute number is sometimes more important than these percentages. This means that even if these indicators of viability are good, however, the density of sperm is low and there will be few sperm with sufficiently good viability as well. In contrast, some semen with mildly low sperm motility, but with sufficient density of sperm, will likewise have good fertility. Again, the presence of abnormal semen liquefaction is a factor to consider. For the same sperm viability, individuals with abnormal semen liquefaction will definitely have lower fertilization capacity. In addition, the sperm deformity rate needs to be evaluated in combination. Some semen samples with severe malformations have good sperm motility, so it is obvious that the problem needs to be focused on the malformation rate first. Finally, it is important to remember that a routine semen examination cannot be based on a single test, but needs to be repeated several times for a comprehensive evaluation.