Premarital urinalysis is a test for urine routine and urine sediment, which is just an ordinary test and is no different from the urinalysis during a normal medical examination. The urine test can roughly determine whether there is infection in the urinary system, whether there is proteinuria, whether there is abnormal bilirubin metabolism, whether there is elevated urine sugar level, whether there is bleeding disorders, etc. If there are abnormalities in the above indicators in the routine urine examination, further examination is needed, such as elevated white blood cell count, further bacterial culture is recommended to confirm the presence of urinary tract infection; if there is protein in the urine, further examination of urine microprotein, 24-hour urine protein quantification, kidney function, etc. is needed to detect whether there is nephritis; abnormal bilirubin metabolism, further examination is needed If urine glucose is elevated, further testing of fasting glucose is needed to find out if diabetes is present. Because the early stages of these diseases have no obvious specific symptoms, or only minor symptoms that cause patients to ignore the diagnosis of the disease. Therefore, the premarital urine test is only a general screening of the body, if there are abnormalities, further tests are needed to understand the early or latent phase of the disease, so that the disease will not be delayed and can be treated in a timely and effective manner.