Your GI doctor will ask a series of questions related to your symptoms and ask you a Liver function test to check hepatitis B, hepatitis C, to determine the effect of side effects of known medication and Liver disorder.
For further diagnosis below procedure will be done to monitor the liver function or related organs:
1) Liver Biopsy: It's a procedure done using a needle to remove a small amount of tissue from your liver for further examination in a lab. This will help to diagnose if there is any liver damage or any other problem.
2) CT scan: it will show a 3D picture of the liver and gallbladder.