Case 4

A 59-year-old female presents with acute renal failure, a creatinine of 10.0 mg/dL, and active urine sediment with manyRBC's &RBCcasts.

Questions

  1. What are the predominant pathologic findings seen on renal biopsy?
  2. Immunofluorescence is entirely negative. What serologic study would most likely be positive in this patient?