Q. Which cholesterol is the bad cholesterol and what level is considered high cholesterol? I keep on hearing about cholesterol and how it is bad for you though I understand that there are two kinds of cholesterol and that only one of them is bad, which is it? Also, what level is considered high cholesterol? A. Cholesterol can’t dissolve in the blood. It has to be transported to and from the cells by carriers called lipoproteins. Low-density lipoprotein, or LDL, is known as “bad” cholesterol. High-density lipoprotein, or HDL, is known as “good” cholesterol. These two types of lipids, along with triglycerides and Lp(a) cholesterol, make up your total cholesterol count, which can be determined through a blood test. If your total cholesterol is 200 mg/dL or greater, or if your HDL is less than 40 mg/dL, then you will probably need treatment.