Andrew Huberman· PhD
apob refers to the lipoprotein the singular lipoprotein wrapped around an LDL particle so if you happen to be lucky enough that your doctor measures an apob level it's a blood test it says apob X number of milligrams per deciliter that's measuring the concentration of that protein it is a direct measurement of the concentration of LDL and vldl particles when you have a blood test that says LDL it usually doesn't say LDL it usually says ldlc or LDL cholesterol because LDL is not a laboratory measurement LDL cholesterol is a laboratory measurement and it's just taking the total number of LDL particles breaking them apart and measuring how much cholesterol is in them so ldlc measures the total concentration of cholesterol in the ldls apob measures the number of them and they're different