The amount of a intraflagellar transport protein 22 homolog (human) when measured in cerebrospinal fluid. The trait is level of intraflagellar transport protein 22 homolog (human) in cerebrospinal fluid (OBA_2081020, an Ontology of Biological Attributes term). Also known as: cerebrospinal fluid intraflagellar transport protein 22 homolog (human) amount.