1, check semen analysis Semen analysis refers to the appearance of the semen discharged by the patient and microscopic detection of a series of indicators of an examination program, is the assessment of male fertility is the most basic, the first checkup program for the evaluation of male infertility to provide an important basis for the evaluation of abnormal results often suggests that the fertility of reduced. The test indicators include semen volume, semen appearance, degree of liquefaction, total sperm count, sperm density, sperm vitality, sperm survival rate, sperm morphology, etc. Among them, the sperm count and vitality are the ones that have the closest relationship with fertility, and sperm morphology test is an important reference for predicting the success rate of in vitro fertilization-embryo transfer. Precautions are required for patients before semen analysis ① Abstinence should be maintained for 3~5 days. The length of abstinence before semen discharge can cause significant changes in semen volume and sperm density, affecting the results of semen examination. In the first 4 days after the spermatozoon, the sperm density is reported to increase by 25% per day, and the semen volume and the total number of sperm increase with the prolongation of the abstinence time, but the vitality and morphology of the sperm are not affected. 4 days after the sperm count increases slowly, and the sperm density decreases when it exceeds 7 days, and prolonged abstinence can cause the number of dead sperm and abnormal sperm to increase. The number of dead spermatozoa and abnormal spermatozoa can increase after prolonged abstinence. Therefore, generally advocate abstinence 3 ~ 5 days to do semen examination. WHO recommends abstinence time for 2 ~ 7 days, abstinence time shorter than 2 days or longer than 7 days, the semen quality has a greater impact on the general do not use. ② Collect all semen intact when removing semen. When the semen is ejected, the initial pre-seminal discharge is clear and sticky, mainly lubricate the urethra to facilitate the role of ejaculation, sperm content is very small; followed by the main part of the discharge is ejaculation, the highest number and quality of sperm; the last ejaculation is the post-seminal discharge, sperm count is very small, fertilization quality is also very low. Therefore, when masturbating to collect semen, you need to align the semen collection container to collect all the semen completely. ③ Is it possible to collect semen at home and send it to the hospital later? Under normal circumstances, the liquefaction time of semen is 15-20 minutes after discharge. The composition and pH value of liquefied semen will change over time, and prolonged storage of semen will inevitably lead to affected sperm viability; therefore, semen analysis should be performed within 1 hour after semen collection, and should not take more than 2 hours in case of incomplete liquefaction or total non-liquefaction of semen. In addition, both semen liquefaction and sperm viability are affected by temperature. Therefore, semen should be collected close to the examination room in the hospital. If the patient can not adapt to and can not collect semen in the hospital, semen can be collected at home or in a hostel near the hospital, etc. However, semen should be sent to the examination room in the hospital within 30 minutes after it is taken out, and the specimen should be kept warm by keeping the specimen close to the body and keeping it at 25~37° in case of cold days. 2, semen examination results are not good, can be an interval of 2 to 3 weeks and then re-examination semen volume, sperm density, sperm vitality and other parameters by the usual level of health, the rest of the good and bad, drinking alcohol and many other factors. Therefore, each time the semen analysis results may be different, or even a big difference, can not make an evaluation of the results of a semen analysis, the need for an interval of 2 to 3 weeks to carry out 2 to 3 semen examination, which can be the basic function of the production of spermatozoa have a proper evaluation. 3.Repeat examination results are not good for special project examination Special project: mainly used for confirming the diagnosis and disease classification, according to the test results of the basic project and the different requirements of patients, including reproductive system ultrasound, endocrine hormone testing, seminal plasma testing, chromosome testing and testicular biopsy.