An isolated peptidic fragment of apolipoprotein E comprises at least 3 contiguous amino acids, Including glycosylated threonine 194, threonine 289, serine 94, or serine 76 of SEQ ID NO.: 1, or any combination of those. An antibody capable of binding to the isolated peptidic fragment. A method of detecting a naturally-occurring circulating atherogenic low-density lipoprotein in a plasma sample from an individual, comprising qualitatively and/or quantitatively detecting in a low-density lipoprotein that binds to the antibody. A method of assessing an individuals risk of ischemic heart disease and/or atherosclerosis comprises quantifying in a plasma sample from the individual an amount of apolipoprotein E comprising glycosylated threonine 194, threonine 289, serine 94 or serine 76 of SEQ ID NO.: 1, or any combination of those.
