A 12-year-old boy is brought to the physician for a 2-day history of progressive swelling of the eyes. He has no past medical history. Vitals are normal. Physical examination shows mild infraorbital and pedal edema bilaterally. There is no abdominal fluid wave. Laboratory studies show:
Complement protein C3 150 mg/dL (NR 88-201)
Complement protein C4 40 mg/dL (NR 16-48)
ALT 35 U/L
AST 30 U/L
Urine protein 2+
Urine RBC 0-1/hpf
Which of the following is most likely to be seen in this patient?
