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Atypical Nephrotic Biopsy Diabetes Short Duration — ESENeph MCQ

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ModerateGlomerulonephritisAtypical Nephrotic Biopsy Diabetes Short DurationESENeph

A 40-year-old man with no known kidney disease presents with bilateral ankle oedema and frothy urine. Urine dipstick: protein 4+, blood trace. Serum albumin 19 g/L. eGFR 92 mL/min/1.73m2. Cholesterol 12.4 mmol/L. He has type 2 diabetes controlled on metformin. Duration of diabetes is 2 years. What investigation is MOST important to determine the cause of his nephrotic syndrome?

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Correct answer: D — Renal biopsy

Although this patient has diabetes, the SHORT duration (2 years), ABSENCE of retinopathy (which typically precedes diabetic nephropathy), full-blown nephrotic syndrome, and well-preserved eGFR make diabetic nephropathy unlikely as the sole cause. In patients with diabetes and atypical features for diabetic kidney disease, renal biopsy is essential to identify the true cause — which may be primary glomerular disease (membranous nephropathy, minimal change disease, FSGS, amyloidosis) or diabetic nephropathy. Up to 30-40% of diabetic patients biopsied for atypical nephrotic syndrome have a NON-diabetic glomerular disease, which is often treatable. Anti-PLA2R testing is useful but does not replace biopsy, as it only identifies one subtype.

Reference: KDIGO 2021 – Glomerular Diseases; Sharma et al 2013 – Non-Diabetic Renal Disease in Diabetes