HBA1C, oral glucose tolerance test, urea and electrolytes, thyroid stimulating hormone, HIV serology, hepatitis C serology/viral load, ESR, ACE level, ANA, anti-Ro/La antibodies, rheumatoid factor/anticyclic citrullinated peptide antibodies, antitissue transglutaminase antibody, serum electrophoresis, vitamin B12 levels, leucocyte α-galactosidase A activity (Fabry's disease), lipid profile. The gene discussed is ACE; the disease is Fabry disease.