This article was reviewed by Felix Gussone, MD. Key Takeaways: Biomarker testing uses blood, saliva, or tissue to measure specific health metrics and provide insights into your body’s functioning.

PSA stands for prostate-specific antigen, a substance naturally produced in prostate tissue. A small amount of PSA regularly sneaks into the bloodstream, and low blood concentration is considered ...

Mohana Ravindranath is a freelance health, science, and tech journalist and a 2025 Association for Health Care Journalists fellow. She was previously a Bay Area health tech correspondent for STAT.

Staying on top of your health isn’t just about hitting the gym, eating well, or getting the necessary vaccines. It also means knowing what’s happening inside your body, which is why scheduling an ...