the concentrations of the main lipoprotein density classes , namely very low-density lipoproteins ( vldl ) , intermediate-density lipoproteins ( idl ) , low-density lipoproteins ( ldl ) , high-density lipoproteins2 ( hdl2 ) and hdl3 , are measured by rate zonal ultracentrifugation .
C0023820
lipoprotein
C0023825
very low-density lipoproteins