Harvard Health Blog
Cholesterol: Understanding HDL vs. LDL
By: Ami Bhatt, MD, FACC, Contributor There are two main types of cholesterol: high-density lipoprotein (HDL) and low-density lipoprotein (LDL). (Lipoproteins are made of fat and protein, and serve as vehicles for your cholesterol to travel through the blood.) Cardiologists are often asked about low-density lipoprotein (LDL) versus high-density lipoprotein (HDL). The difference is important to understand. What does HDL cholesterol do?