Blood tests are a common diagnostic tool used to evaluate many aspects of health, from routine checks to targeted investigations. A blood test involves drawing a small sample of blood that laboratory equipment analyzes for cells, chemicals, proteins, hormones, or markers associated with specific conditions. Results can help assess organ function, detect infections, monitor chronic diseases, and guide further testing. For example, a prostate-specific antigen (PSA) blood test measures a protein produced by the prostate and can be part of evaluating prostate health. Interpreting results requires clinical context: age, symptoms, medical history, and other tests all affect meaning. Understanding what different blood tests measure and how results are used can help you have more informed conversations with healthcare providers and local services about your health.
