plasma phospholipid level blood low density lipoprotein phospholipid level plasma low density lipoprotein phospholipid level 2013-05-08T13:01:48Z CMO:0001569 JSmith Measurement of the amount of phospholipid, any of various phosphorus-containing lipids that are composed mainly of fatty acids, a phosphate group, and a simple organic molecule such as glycerol, carried in low-density lipoprotein (LDL) molecules in a specified volume of plasma, the fibrinogen-containing fluid portion of the blood in which the particulate components are suspended. LDL constitute a class of relatively large, heterogeneous lipoprotein particles, complex molecules that consist of a protein membrane surrounding a core of lipids. The LDL class of lipoproteins has a density between 1.019 and 1.063 g/ml. In some animal species, such as canine and rodents, this may overlap with the HDL1 class and be designated LDL/HDL1. Values for density ranges of the lipoprotein classes are approximate. The classes may be defined differently by different researchers, in part because class definitions depend on the number of subclasses into which the lipoprotein fractions are divided. clinical_measurement_ontology plasma LDL phospholipid level