What lab tests can be done to rule out autoimmune hepatitis? i got alt 75 u/l recently and i have back and joint pain. ana was +ve once and then -ve.

Biopsy: well this was disappointing. http://www.ncbi.nlm.nih.gov/pubmed/19072441 there's a lot of antibody tests. If they are all low or zero level it makes it pretty unlikely. Even a better test if you find something likely to be the cause and fix it.... then that's the answer (hep c, drug associated, heart failure, etc.) Otherwise the only test that can mostly give fairly strong results is liver biopsy.