PSA refers to Prostate Specific Antigen.How often PSA is checked is determined by the age of the person being tested, family medical history etc. As a medical checkup, it is usually done once a year. 1. Age of the examinee: Men over the age of 50 are usually recommended to have a PSA test once a year to determine if they have prostate disease. 2. Family history: If there is a family history of prostate cancer in the examiner’s family, it is usually recommended to have a prostate-specific antigen test once a year. This is because people with a family history of the disease have a greater chance of developing the disease and should be examined more regularly. The prostate-specific antigen test is primarily used to screen for prostate cancer and is a specific indicator, which is done through a blood test. The normal range of PSA is 0~4ng/mL. Benign prostatic hyperplasia, prostatitis and other diseases may also lead to elevated PSA levels, and the specific diagnosis of the disease needs to be confirmed by combining with other clinical examinations, such as prostate ultrasound, anal diagnosis, and prostate aspiration biopsy, etc. If you are unable to determine the frequency of the test, you can go to a clinic to have the test done. If you are unable to determine the frequency of the examination, you can go to the urology department, consult with a professional doctor and follow the doctor’s advice to carry out the examination.