Hello welcome to the health care magic Your child having acute liver failure cause and admitted for that... The causes can be as follow which should be ruled out with history, examination and investigation accordingly... -Drug induced (hepatotoxic drugs) -viral hepatitis (if jaundice, abdominal pain present at the time of admission) -Metabolic disorder like Wilson disease, alpha 1 antitrypsin deficiency etc... -cardiovascular problem like septicemia, heart failure etc... So according to cause found treatment will be instituted until then Symptomatic management done Hence suitable investigation done according to suspected cause like serum hbsag testing by ELISA, HBA ELISA, HCV ELISA, serum ceruloplasmin, EKG etc.... Take care Hope your concern solved