The amount of a serine hydroxymethyltransferase, cytosolic (human) when measured in cerebrospinal fluid. The trait is Ontology of Biological Attributes term OBA_2057681 (level of serine hydroxymethyltransferase, cytosolic (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid serine hydroxymethyltransferase, cytosolic (human) amount.