A 19-year-old man comes to the physician for a 4-day history of swelling around his eyes. He had tonsillitis two weeks ago that resolved with penicillin. Blood pressure is 165/95. Physical examination shows periorbital edema and mild ankle edema. Laboratory studies show:
Serum urea nitrogen: 50 mg/dL
Serum creatinine: 3.5 mg/dL
Urine protein: 1+
Urine RBCs Many
Urine WBC Few
Which of the following is the most likely diagnosis?
Nephrotic syndrome
Goodpasture syndrome
Granulomatosis with polyangiitis
IgA nephropathy
Proliferative glomerulonephritis
Usual interstitial pneumonitis
