The reference range for liver function tests includes: SGPT(ALT) - 13 - 69 U/L SGOT(AST) - 15 - 45 U/L Alkaline phosphatase - 38 - 126 U/L Albumin - 3.5 - 5.0 g/L Total Protein - 6.3 - 8.2 g/L Total bilirubin - 0.2 - 1.3 mg/dL Direct bilirubin - 0.0 - 0.3 mg/dL Indirect bilirubin - 0.0 - 1.1 mg/dL Gamma GT - 12 - 58 U/L These results are for adults. Normal ranges vary slightly from lab to lab and are different for children.