blood intermediate-density lipoprotein cholesterol measurement test serum intermediate-density lipoprotein cholesterol measurement test 2014-01-15T11:16:42Z A test which determines the amount of cholesterol carried in intermediate-density lipoprotein (IDL) particles in a sample of serum, the clear liquid that separates from blood after it has clotted completely, i.e. blood plasma from which fibrinogen has been removed. IDL are relatively large lipoprotein particles (complexes that consist of a protein membrane surrounding a core of lipids) formed by degredation of very low density lipoproteins (VLDL) particles and thus having a size intermediate between those of VLDL and low density lipoproteins. JSmith MMO:0000473 measurement_method_ontology serum IDL-cholesterol test