The amount of a alpha-1,3-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase B (human) when measured in cerebrospinal fluid. The trait is Ontology of Biological Attributes term OBA_2081702 (level of alpha-1,3-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase B (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid alpha-1,3-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase B (human) amount.