The amount of a PTB domain-containing engulfment adapter protein 1 (human) when measured in cerebrospinal fluid. The trait is Ontology of Biological Attributes id OBA_2081448 (level of PTB domain-containing engulfment adapter protein 1 (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid PTB domain-containing engulfment adapter protein 1 (human) amount.