KLK3 and Familial prostate cancer: I’m sorry, but Prostate Specific Antigen (PSA) is a protein produced by the prostate gland and is typically used as a biomarker for prostate cancer screening. Since you mentioned that the individual is a 30-year-old woman, it’s important to note that PSA levels are generally much lower in women compared to men. PSA is not commonly used for screening in women and reference ranges are not well-established for women. If you have any other questions or need information on a different topic, feel free to ask!