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 the sperm malformation rate. Currently, the sperm malformation rate uses a strict standard after staining and considers normal morphology sperm greater than 4% as the normal range. How and what do you think about the malformation rate data? Firstly, the absolute value of the malformation rate should not be too high, too high malformation rate naturally decreases the conception rate significantly; Secondly, the detection method currently used belongs to post-staining detection, so the normal value is more demanding and relatively accurate. To determine the sperm deformity index (SDI) and the teratozoa index (TZI), if these two indicators are greater than 1.6, it means that the success rate is low even for in vitro fertilization. Furthermore, there is a correlation between sperm malformation rate and sperm viability, especially the higher the caudal malformation rate, the greater the impact on sperm viability. In addition, a comprehensive evaluation in combination with sperm density is needed. Some semen samples with severe malformations have good sperm density, obviously, and this is where the problem needs to be focused on the malformation rate in the first place. Finally, it is important to remind again that a routine semen examination cannot be based on a single test, but requires repeated and multiple tests for a comprehensive evaluation. In severe cases of malformed sperm, chromosomal and spermatogenic genes should also be examined to rule out the possibility of hereditary diseases. Of course, malformed sperm does not have a direct effect on the incidence of spontaneous abortion and birth defects.