NBME Peds Q really bothering me, IgA Nephropathy vs PSGN

13 year old boy was brought in for a routine well-child exam. No history of prior serious illness. During the past 2 years he's complained of brown urine whenever he's had a cold. He has no complaints of urgency, dysuria, or incontinence. PE is unremarkable. Lab studies show: Serum: BUN: 15 Cr: 0.9 C3 90 mg/dL (nl 83-177) Urine: Blood 4+ Protein 3+ A) Hemorrhagic cystitis B) HUS C) IgA nephropathy D) Nephrotic Syndrome E) PSGN The answer is supposed to be E, but I can't seem to... NBME Peds Q really bothering me, IgA Nephropathy vs PSGN
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