A 2 month old girl has failure to thrive, polyuria and medullary nephrocalcinosis affecting both kidneys. Investigations show blood pH 7.48, bicarbonate 25 mEq/l, potassium 2 mEq/l, sodium 126 mEq/l and chloride 88 mEq/l. The most likely diagnosis is –

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Vikas Bhardwaj
Medical Technologist, AIIMS New Delhi
Updated: Apr 17, 2026