Blood testing is a medical procedure that involves taking a sample of blood to analyze it for various health indicators. This process can help diagnose diseases, monitor health conditions, and assess how well organs are functioning. Common tests include checking for glucose levels, cholesterol, and complete blood count (CBC). The blood sample is usually collected from a vein in the arm using a needle. After collection, the sample is sent to a laboratory where it is examined using specialized equipment. Results are typically available within a few days and can provide valuable information for doctors to make informed decisions about a patient's health.