Blood work refers to a series of tests performed on a sample of blood to assess a person's health. These tests can measure various components, such as red and white blood cells, platelets, and different chemicals in the blood. Common types of blood work include a complete blood count (CBC) and blood chemistry tests, which help doctors diagnose conditions, monitor health, and evaluate organ function. During blood work, a healthcare professional typically draws blood from a vein in the arm using a needle. The sample is then sent to a laboratory for analysis. Results can provide valuable information about a person's overall health and help guide treatment decisions.