A previously healthy 20-year-old man presents to your clinic with a complaint of “coca-cola”–colored urine that he noticed this morning. Since the first episode, he has had two more episodes of dark urine. Yesterday, he developed upper respiratory symptoms of clear rhinorrhea, sore throat, and nonproductive cough. On physical examination, he has a normal BP and temperature is 38ºC. On examination reveals clear rhinorrhea with erythematous and slightly swollen nasal turbinates. There is minimal pharyngeal erythema without any tonsillar exudates. Results of abdominal examinations are normal. Urinalysis is positive for 100 RBCs/HPF and 2+ protein. Serum complement levels are normal. Which of the following is the most likely diagnosis?
A. Systemic lupus erythematosus (SLE)
B. Cryoglobulinemia
C. Membranoproliferative glomerulonephritis
D. Poststreptococcal glomerulonephritis
E. IgA nephropathy
A. Systemic lupus erythematosus (SLE)
B. Cryoglobulinemia
C. Membranoproliferative glomerulonephritis
D. Poststreptococcal glomerulonephritis
E. IgA nephropathy