The PSA test is the frontline screening tool for prostate health. It measures the level of a protein produced by the prostate gland, and elevated levels can be the earliest sign of prostate cancer, often years before symptoms appear. It's also used to detect non-cancerous conditions like an enlarged prostate (BPH). This test is an essential part of a man's routine health check-up, especially for those over 50. A simple blood draw is a small step for a test that provides invaluable, life-saving information.