LFTs -liver function tests, are quite accurate for liver damage in alcoholic and non-alcoholic liver disease. The following REF demonstrates high sensitivity to liver damage:
However, the gold standard is a liver biopsy of which I have seen 1000s as a surgical pathologist. The biopsy can even potentially assess potential damage, as acute inflammation in a fatty liver of whatever cause is indicative of rapidly progressing severe disease.
Finally, thank you for this important article. Please accept my since condolences of your Father's death from Alcoholic Liver Disease - not a pleasant way to exit life IMO. Blessings to you and your family.
Peace (needed more than ever),
Peter H. Dohan, MD
sane Portland Maine