You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is What is the normal level of PSA (prostate specific antigen) in males? and explain in detail?
Normal PSA level is less than 4 ng/ml. Prostate-specific antigen (PSA) is an androgen regulated serine protease produced by the prostate epithelium. It is normally present in low concentrations in the blood of all adult males. PSA levels may be elevated in the blood of men with benign prostate conditions such as prostatitis and benign prostatic hyperplasia, as well as in men with prostate cancer. It is useful in evaluating the effectiveness of prostate cancer treatment and monitoring for recurrence after therapy.