LFTs to assess ALT/AST
CBC to assess for anemia (followed by testing for Coombs-negative hemolytic anemia)
Ocular slit-lamp to assess for Kayser-Flesicher rings
Outpatient ceruloplasmin concentration, serums copper concentration, 24-hour urinary copper excretion
Wilson's disease
Infectious
Paget-Schroetter syndrome
Hepatitis
Hemochromatosis
Malaria
Addison's disease
HIV 