Semen test is the most basic, simple and important way for doctors to determine a man’s fertility. How can we make the semen test results more correct? The following points should be noted: 1. It is best to abstain from sex (no sex or masturbation) for 3-5 days before coming to the hospital for semen examination. This is because if the interval between semen collection is too short, the number of sperm and the volume of semen will decrease; if it is too long, dead sperm and abnormal sperm will increase. 2. It is best to use the masturbation method to collect semen so as to ensure the integrity of the semen collected. Semen should not be collected by using the ordinary condom method of intercourse, because the general condom contains components that can kill sperm, and the semen collected by this method affects the analysis of sperm motility. 3. If semen is taken at a place far away from the laboratory where the semen test is done (such as at home or in a hotel), the semen taken out should be sent to the laboratory within half an hour, and care should be taken to keep it warm during transportation. When the temperature is too low (especially in winter), it is best to bring it to the laboratory close to your underwear. 4. When taking semen, be careful not to spill the semen outside. If the semen taken is incomplete, it is difficult to make a correct judgment of the semen.