Evaluation of Patients With Liver Disease

* INCLUSION CRITERIA: Affected Subjects In order to be eligible to participate in this study, an affected participant must meet all of the following criteria: 1. \>=2 years of age. 2. Meets one of the following: 1. Suspected or evidence of acute or chronic liver disease on evaluation by a referring licensed independent practitioner (LIP), OR 2. At risk for acute or chronic liver disease Healthy Volunteers In order to be eligible to participate in this study, a healthy volunteer must meet all of the following criteria: 1. \>= 18 years of age. 2. In good general health as evidenced by medical history EXCLUSION CRITERIA: Affected Participants An affected participant who meets any of the following criteria will be excluded from participation in this study: 1\. History of significant medical illnesses that might interfere with prolonged follow up evaluation Healthy Volunteers A healthy volunteer who meets any of the following criteria will be excluded from participation in this study: 1. Any chronic medical condition, including (but not limited to) heart, kidney, or lung diseases 2. Taking any regular medications or supplements (with the exception of regular multivitamins and/or oral contraceptives) 3. Average alcohol consumption \> 1 drink/day in past 6 months, per self-report 4. History of liver disease (with the exception of neonatal jaundice) 5. History of severe illness, infection or major surgery in the past year 6. History of cancer (with the exception of basal cell carcinoma resected \> 1 year prior to enrollment) 7. BMI \< 18 or BMI \>25 8. Hemoglobin \< 11 (women) or hemoglobin \< 12 (men) 9. ALT \>35 (men) or ALT \>25 (women) 10. Alkaline Phosphatase \>= 150 11. Bilirubin \>2 g/dL 12. HIV positive, Anti-HCV positive, HBsAg positive or Anti-HBc positive 13. Pregnancy 14. Inability to provide informed consent