The amount of a phosphatidylinositol-3,4,5-trisphosphate 5-phosphatase 1 when measured in blood. The trait is Ontology of Biological Attributes term OBA_2050461 (level of phosphatidylinositol-3,4,5-trisphosphate 5-phosphatase 1 in blood). Also known as: blood phosphatidylinositol-3,4,5-trisphosphate 5-phosphatase 1 amount.