Abnormally increased serum levels of alkaline phosphatase activity. The phenotype is Human Phenotype Ontology id HP_0003155 (Elevated circulating alkaline phosphatase concentration). Also known as: Elevated ALP, Elevated alkaline phosphatase, Greatly elevated alkaline phosphatase, High serum alkaline phosphatase, Hyperphosphatasemia, Hyperphosphatasia, Increased alkaline phosphatase, Increased serum alkaline phosphatase.