The amount of a 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase beta-1 when measured in blood. The trait is level of 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase beta-1 in blood (OBA_2050824, an Ontology of Biological Attributes term). Also known as: blood 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase beta-1 amount.