A high-density lipoprotein (HDL) test measures the level of good cholesterol in your blood. … Cholesterol is carried through the bloodstream attached to proteins called lipoproteins. Two types of cholesterol in your body are HDL, which is the good cholesterol, and low-density lipoprotein (LDL), or bad cholesterol
HDL cholesterol levels greater than 60 milligrams per deciliter (mg/dL) are high. That’s good. HDL cholesterol levels less than 40 mg/dL are low. That’s not so good.
Typically, doctors recommend an HDL level of 60 milligrams per deciliter (mg/dL) of blood or higher. HDL that falls within the range of 40 to 59 mg/dL is normal, but could be higher. Having HDL under 40 mg/dL increases your risk of developing heart disease.