The amount of a SH3 and multiple ankyrin repeat domains protein 3 (human) when measured in cerebrospinal fluid. The trait is level of SH3 and multiple ankyrin repeat domains protein 3 (human) in cerebrospinal fluid (OBA_2080810, an Ontology of Biological Attributes entry). Also known as: cerebrospinal fluid SH3 and multiple ankyrin repeat domains protein 3 (human) amount.