Timing of hematuria in IgA nephropathy after a mucosal infection is best described as which of the following?

• A. Immediately
• B. 1-2 weeks after
• C. 1-2 days after
• D. 1-2 months after

Answer: (C)

IgA nephropathy typically presents with hematuria that occurs soon after a mucosal infection because mucosal IgA–containing immune complexes form in response to the infection and deposit in the glomerular mesangium. This leads to hematuria within a short window, usually within 1–2 days after the illness starts. The timing helps distinguish it from other post-infectious glomerulonephritides, where the lag is longer (like 1–3 weeks). So the best description is that hematuria appears about 1–2 days after the mucosal infection.