APOB and hyperlipidemia: The last serum lipid marker evaluated in this analysis, LDL, is another key biomarker for hyperlipidemia and coronary heart disease (CHD), alongside other factors such as small dense LDL (sd-LDL), non-high-density lipoprotein cholesterol (non-HDL-c), and Apolipoprotein B (ApoB) (36, 37).