Dyslipidemia is a high level of lipids (cholesterol, triglycerides, or both) carried by lipoproteins in the blood (see page Overview of Cholesterol and Lipid Disorders). This term includes hyperlipoproteinemia (hyperlipidemia), which refers to abnormally high levels of total cholesterol, low density lipoprotein (LDL)—the bad—cholesterol, or triglycerides, as well as an abnormally low level of high density lipoprotein (HDL)—the good—cholesterol.