Thanks for posting your query at DoctorSpring. I am Dr.R.K and I am pleased to assist you.
Your son's liver function test is quite abnormal. He is negative for hepatitis B and A. He needs further testing to find the cause. The next few tests to be done are ultrasound scan of abdomen, PT/INR, tests for hepatitis C and E, serum ceruloplasmin,ferritin, ANA,AMA. Further management depends on the test report. Please stop prednisolone and tetracycline.
Please consult a gastroenterologist in your area for these tests and further management.
I hope that answers your question. Please let me know if I can assist you further.