Figure 2. The spectrum of particles is arranged according to hydrated density, molecular mass, molecular diameter, relative concentration, lipid composition and apolipoprotein composition. VLDL, very-low-density lipoprotein; LDL, low-density lipoprotein; HDL, high-density lipoprotein; IDL, intermediate-density lipoprotein; Lp(a), lipoprotein (a). Reproduced with permission from Durrington PN. Hyperlipidaemia: Diagnosis and Management. 2nd edition. London: Butterworth-Heinemann; 1995.