The amount of a phosphatidylinositol 5-phosphate 4-kinase type-2 alpha when measured in blood serum. The trait is level of phosphatidylinositol 5-phosphate 4-kinase type-2 alpha in blood serum (OBA_2042897). Also known as: blood serum phosphatidylinositol 5-phosphate 4-kinase type-2 alpha amount.