Bloods
FBC, Fe studies (haemachromatosis), U+E, LFT (persistently elevated ALT/AST), clotting, TFTs (hypothyroidism), glucose/HbA1C (T2DM), ceroluplasmin (Wilson's), a1-antitrypsin (a1-antitrypsin deficiency)
Virology screen (HBV, HCV)
Autoimmune screen (AIH, PSC, PBC i.e. ANA, ASMA)
Coeliac screen (TTG)
ELF test (measures serum proteases)