blood clusterin level serum clusterin level 2019-02-15T14:01:32Z CMO:0003044 The amount of clusterin in a specific sample of serum, the clear liquid that separates from blood after it has clotted completely, i.e. blood plasma from which fibrinogen has been removed.. Clusterin is a secreted chaperone that can under some stress conditions also be found in the cell cytosol. It has been suggested to be involved in several basic biological events such as cell death, tumor progression, and neurodegenerative disorders. VT:0005416 clinical_measurement_ontology sjwang