An alkaline phosphatase isoenzyme test can be done to check for elevated ALP levels. Tissues that contain high levels of ALP include the liver, bile ducts, and bones. Normal levels of ALP range from 44 to 147 U/L (units per liter) and significantly elevated levels may be an indication of conditions such as , bone disease such as Paget disease, liver disease such as hepatitis, blood disorders, or other conditions.