Also known as Berger disease, IgA nephropathy, in which immune complexes containing IgA are deposited on the glomerular membrane, is the most common cause of glomerulonephritis. Patients have increased serum levels of IgA, which may be a result of a mucosal infection. The disorder is most frequently seen in children and young adults. Patients usually present with an episode of macroscopic hematuria following an infection or strenuous exercise. Recovery from the macroscopic hematuria is spontaneous; however, asymptomatic microhematuria and elevated serum levels of IgA remain.7 Except for periodic episodes of macroscopic hematuria, a patient with the disorder may remain essentially asymptomatic for 20 years or more; however, there is a gradual progression to chronic glomerulonephritis and end-stage renal disease