A cholesterol test, also known as a lipid panel, measures the levels of different types of cholesterol and fats in your blood. It typically checks for low-density lipoprotein (LDL), often referred to as "bad" cholesterol, and high-density lipoprotein (HDL), known as "good" cholesterol. The test also measures triglycerides, another type of fat in the blood. Doctors recommend cholesterol tests to assess heart health and determine the risk of cardiovascular disease. The test is usually done after fasting for 9-12 hours to ensure accurate results. Regular testing can help monitor cholesterol levels and guide lifestyle or medication changes if necessary.