What is non hdl cholesterol, or non-high-density lipoprotein cholesterol, is a crucial component of blood lipid profiles used to assess cardiovascular health. It includes all the cholesterol carried by lipoproteins except high-density lipoprotein (HDL) cholesterol. Non-HDL cholesterol encompasses low-density lipoprotein (LDL) cholesterol, very-low-density lipoprotein (VLDL) cholesterol, and intermediate-density lipoprotein (IDL) cholesterol.