Rapidly progressive glomerulonephritis — RACP Adult Medicine MCQ
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Correct answer: C — Urgent renal biopsy with serological work-up
Rapid kidney function decline with red-cell casts suggests rapidly progressive glomerulonephritis, requiring urgent biopsy plus serology to guide treatment. Obstruction has been excluded by ultrasound. The other tests do not identify crescentic glomerular disease or guide urgent immunosuppression.
Reference: Kidney Health Australia/CARI Guidelines; eTG