The amount of a ectonucleotide pyrophosphatase/phosphodiesterase family member 5 (human) when measured in cerebrospinal fluid. The trait is level of ectonucleotide pyrophosphatase/phosphodiesterase family member 5 (human) in cerebrospinal fluid (OBA_2081551). Also known as: cerebrospinal fluid ectonucleotide pyrophosphatase/phosphodiesterase family member 5 (human) amount.