blood high-density lipoprotein phospholipid measurement test serum high-density lipoprotein phospholipid measurement test 2014-01-15T13:05:30Z A laboratory test which measures the amount of phospholipid (phosphorus-containing lipids composed mainly of fatty acids, a phosphate group, and a simple organic molecule) found in the high-density lipoprotein (HDL) fraction of serum, the clear liquid that separates from blood after it has clotted completely, i.e. blood plasma from which fibrinogen has been removed. HDL is the smallest (diameter approximately 5-15 nm) of the major lipoprotein particles, complexes that consist of a protein layer surrounding a core of lipids. JSmith MMO:0000481 measurement_method_ontology serum HDL phospholipid test