LDL-Cholesterol is a low density lipoprotein, which is commonly referred to as the “bad” cholesterol. LDL-Cholesterol is a transport protein that carries cholesterol from the liver to the arteries, where it is ultimately deposited. LDL is a calculated value: Total Cholesterol – HDL – (Triglycerides/5). This calculation becomes inaccurate if your triglycerides are over 400.