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http://www.labtestsonline.org/understanding/analytes/alp/test.html
http://www.labcorp.com/datasets/labcorp/html/chapter/mono/pr014700.htm
From the Labcorp link. There are many many causes, some of which arent nice.
Causes of high alkaline phosphatase include bone growth, healing fracture, acromegaly, osteogenic sarcoma, liver or bone metastases, leukemia, myelofibrosis, and rarely myeloma.
Alkaline phosphatase is used as a tumor marker.
Hypervitaminosis D may cause elevations in alkaline phosphatase.
In Paget disease of bone there is often isolated elevation of serum alkaline phosphatase. Some of the highest levels of serum ALP are seen in Paget disease.
Cirrhosis, especially in primary biliary cirrhosis, in which fivefold or more increases are seen.
Used alone, alkaline phosphatase may be misleading, so dont read too much into it.
Your Dr is right, you probably do need to see a specialist.
All the Best
CS