higher level of sgpt since long

dear sir,
recent blood test of my wife showed high level of sgpt .they were 41. also she had blood test before 2 month and it also showed sgpt at 37. she is frequently having symptoms of dieheria  and slight fever. we consulted lever specialist and we conducted sonography and lever function test .sonography results are normal and results of lever function tests are    s.bilirubin: 0.3 mg/dl
                s. billirubin direct :0.1mg/dl
                s.bill indirect: 0.2 mg/dl
                sgot(ast) : 36iu/l
                sgpt(alt)   :44 iu/l
            s.alkaline phospate: 118 iu/l
           s. total protine:           7.7 g/dl
          s.albumin:                 4.7 g/dl
           s. globulins:             3.0 g/dl
           protein A/G ration:    1.57

my doctor says that the results are normal except high sgpt. and he advised to repeat these tests monthly for about 4 months to get exact track of sgpt.

but, about 9 months back she was having vomiting problems and my family doctor did lever function test which showed sgpt at 60 and rest was normal. at that time we also checked for sonography and tests for hepatities C & E.   both viruses of hepatities was nil in results. and after 1 month of that problem her sgpt came  at 30 and she was having no problem.

she had never gone for alcohol anor long medication.

my questions are
1) if her sgpt will remain around 40 ,on continuously basis will it be normal ,or any indication of lever damage.
2) what are the other testes for detailed dignosis of high sgpt /lever function other than sonography, and hepatities c/e virus test.

3) are there any medicines that can bring down sgpt level.



please guide me about the same. as i am very much in depression after this proble, and my doctor told to wait for around 4 months results.

thanking you.