ACE and nephrolithiasis: Of the remaining 21/30 patients, 12/21 were excluded for a probable alternative cause of their uveitis or elevated Uβ2M: herpetic iridocyclitis (3), +HLA-B27 (3), + RF (2), highly elevated ACE (1), history of chronic kidney disease (1), IgA nephropathy (1), and history of recurrent/recent kidney stones (1).