For men, there is no greater problem than infertility. According to statistics, about 15% of married couples are infertile, and about 50% of them have male causes. Therefore, for infertile couples, not only women need to undergo some necessary tests, but also men need to do some tests to identify the causes of infertility as early as possible in order to carry out targeted treatment. The experts said that there are many reasons for male infertility, such as congenital developmental abnormalities, cytogenetic chromosomal abnormalities, hypothalamic-pituitary-gonadal dysfunction, endocrine dysfunction, sexual dysfunction and reproductive tract infections, and even psychological factors may be one of the reasons. Therefore, the following types of tests should be done for male infertility. This is the most basic and important clinical indicator to determine male fertility, and the parameters of semen are the first thing the doctor needs to know. Patients should pay attention to: not to have intercourse for 3-5 days during the examination; it is best to take the specimen by masturbation; to ensure that all semen is obtained; and to recheck 1-2 times within 2 weeks. Seminal plasma biochemical examination The analysis of the chemical composition of seminal plasma helps to understand the function of the epididymis, prostate and seminal vesicle glands. When patients have low semen volume, azoospermia, oligospermia, unexplained decreased sperm motility, congenital defects of accessory gonads and diseases of accessory gonads, etc., seminal plasma biochemical examination can be done, commonly with fructose, carnosine, acid phosphatase, etc. Related microbiological examination Sexual urinary and reproductive system infections often lead to male infertility. Pathogenic microorganisms related to male urinary and reproductive system infections include bacteria, viruses, spirochetes, mycoplasma, chlamydia, etc. Commonly, gonococci, papillomavirus, adenoplasma, chlamydia trachomatis, etc. Endocrine examination Reproductive endocrine dysfunction affects male sexual and reproductive function and is an important cause of male infertility. Endocrine examination is mainly related to the determination of sex hormones T, FSH, LH, PRL, E2 and various stimulation tests, such as HCG stimulation test, etc. Genetic examination Normal male related chromosomes and genes are the basis for maintaining normal reproductive function. Abnormalities of chromosomes and genes can lead to abnormal sexual differentiation and/or impaired sperm production, which can seriously affect reproductive function.