Hepatic Function Panel (7) every thing falls into normal except alkalin phosphate s its high at 159. what causes this?Test Low Normal High Reference Range Units Protein, Total, Serum 7.0 6.0-8.5 g/dL Albumin, Serum 4.2 3.5-5.5 g/dL Bilirubin, Total 0.3 0.0-1.2 mg/dL Bilirubin, Direct 0.11 0.00-0.40 mg/dL Alkaline Phosphatase, S 159 39-117 IU/L Ast (Sgot) 22 0-40 IU/L Alt (Sgpt) 32 0-44 IU/L