This is the "bad" cholesterol—the one you need to control. The LDL Cholesterol test measures the level of low-density lipoprotein, the "sticky" cholesterol that builds up in your arteries, leading to atherosclerosis, heart attacks, and strokes. This test is a critical, non-negotiable part of any cardiovascular risk assessment. It is usually calculated or measured as part of our comprehensive Lipid Profile. Knowing your LDL number is the single most powerful, actionable piece of data for protecting your heart. Take control of this number, take control of your health.