Blood analysis is a medical test that examines the components of blood to assess a person's health. It can measure various elements, including red blood cells, white blood cells, platelets, and different substances like glucose and cholesterol. This information helps doctors diagnose conditions, monitor diseases, and evaluate overall health. The process typically involves drawing a small sample of blood, usually from a vein in the arm. The sample is then sent to a laboratory, where it undergoes various tests. Results can provide insights into anemia, infections, diabetes, and other health issues, guiding treatment decisions.