The amount of a gamma-aminobutyric acid type B receptor subunit 1 (human) when measured in cerebrospinal fluid. The trait is OBA_2081457 (level of gamma-aminobutyric acid type B receptor subunit 1 (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid gamma-aminobutyric acid type B receptor subunit 1 (human) amount.