blood sitosterol measurement test serum sitosterol measurement test 2014-04-29T14:51:28Z A method to determine the nature, properties, or composition of sitosterol in serum, the clear liquid that separates from blood after it has clotted completely, i.e. blood plasma from which fibrinogen has been removed. Sitosterol is a phytosterol (molecular formula C29H50O) with chemical structures similar to that of cholesterol. CHEBI:27693 JSmith MMO:0000522 measurement_method_ontology serum sitosterol analysis