A 9-year-old boy is brought to the physician by his mother for a 12-hour history of dark, “cola-colored” urine. His past medical history is unremarkable apart from a fever and sore throat a couple weeks ago in which a 1-week course of penicillin was prescribed. Which of the following is most likely to be seen in this patient?
A) Antibodies against nephritis-associated plasmin receptor (NAPlr)
B) IgA deposition in the mesangium
C) Leukocytoclastic vasculitis
D) Subendothelial deposits
E) 2+ blood on urine dipstick; 0-2 RBCs/hpf
