If you go to the urology department for prostate problems, your doctor will often have to do a prostate fluid test for you. Why is it necessary to check the prostate fluid? Well, let us first understand about prostate fluid. The prostate fluid is the secretion of the prostate gland and is an important component of semen, accounting for about 30% of the total semen. The main components of the prostate fluid are the high concentration of zinc ions, prostate-specific antigen, citric acid, acid phosphatase, protein hydrolase, fibrinase, prostate vesicles, spermine and so on. The main functions of these components are described below: 1. Zinc Anti-infection, regulation of prostate-specific antigen promotes the activity of semen liquefaction enzymes and protects the stability of sperm DNA. 2, prostate-specific antigen (PSA) important enzyme for semen liquefaction PSA decreases when semen liquefaction is poor and sperm motility is low. In the case of prostate cancer or prostate hyperplasia, the level of prostate-specific antigen can be significantly increased. 3. Citric acid maintains the appropriate pH of semen and maintains the osmotic pressure balance of semen. Binds free zinc and participates in semen liquefaction. 4.Acid phosphatase Related to sperm vitality and an indicator for detecting the function of prostate secretion. 5.Fibrinolytic enzyme Liquefies semen. 6, prostatic vesicles It has the function of protecting sperm and increasing sperm vitality. Prevents premature acrosome reaction and many other functions. 7.Spermine Inhibits immune response and is related to prostate cell proliferation. Prostate-specific antigen and other related protein hydrolases are the enzymes for semen liquefaction. Prostatosomes are an extracellular organelle in prostatic fluid that can only be observed through the microscope, secreted by the glandular epithelial cells of the prostate, named prostatosomes, a particulate component of seminal plasma, with a variety of proteins present within the prostatosomes or on the surface of their membranous structures. Most intriguing is the ability of prostatic vesicles to fuse with the sperm membrane, and prostatic vesicles also enhance sperm viability. Membrane fusion prevents premature acrosome reactions, and prostatic vesicles protect sperm from damage in the female reproductive tract with their immunosuppressive, antioxidant and anti-pathogenic microbial properties. The most abundant in prostatic fluid are acid phosphatase, citrate and zinc ions, which are usually applied clinically to initially determine prostate function.