Serum LDL Cholesterol level test measures the amount of low-density lipoprotein (LDL) cholesterol in the blood. LDL cholesterol is often referred to as "bad" cholesterol because high levels can lead to plaque buildup in the arteries, increasing the risk of heart disease and stroke. This test is crucial in assessing an individual's risk for cardiovascular diseases and guiding decisions on lifestyle changes or medications to lower cholesterol levels. Monitoring LDL cholesterol is important for preventing heart-related health issues, especially in individuals with risk factors for heart disease.