Non-Alcoholic Fatty Liver Disease (NAFLD): Given the patient's age, elevated AST and ALT levels, and an iron saturation of 80% with an iron level of 173, NAFLD is a strong consideration. The fibroscan metavir score of F0 indicates no significant fibrosis, which aligns with early stages of NAFLD. The absence of significant findings on the autoimmune and hepatitis panels further supports this diagnosis.

Hemochromatosis: Although the autoimmune and hepatitis panels are unremarkable, the high iron saturation and iron level could suggest hemochromatosis, especially if the patient has a family history or other suggestive findings.
Drug-Induced Liver Injury: The patient's elevated liver enzymes could be due to medication use, which is a common cause of liver enzyme elevations in outpatient settings.
Alcoholic Liver Disease: Despite the absence of specific information on alcohol use, this remains a possibility, especially if the patient consumes alcohol regularly.

Wilson's Disease: Although rare, Wilson's disease can present with elevated liver enzymes and requires early diagnosis to prevent liver damage. It's crucial to consider, especially in younger patients, but can occasionally present in older adults.
Alpha-1 Antitrypsin Deficiency: This genetic disorder can cause liver disease and should be considered, especially if there's a family history or other systemic symptoms.
Budd-Chiari Syndrome: This condition, caused by hepatic vein thrombosis, can present with acute liver dysfunction and is critical to diagnose early due to its high mortality rate if untreated.

Primary Biliary Cholangitis (PBC): An autoimmune disease of the liver that can present with elevated ALP and liver enzymes. It's less common but should be considered, especially in middle-aged women.
Primary Sclerosing Cholangitis (PSC): Another autoimmune condition affecting the bile ducts, which can cause elevated liver enzymes and ALP. It's rare and often associated with inflammatory bowel disease.
Mitochondrial Disorders: These are a group of disorders that can affect the liver among other organs, presenting with a variety of symptoms including elevated liver enzymes. They are rare and often have a genetic basis.