A 40 year old woman presents to the emergency depament with severe abdominal pain localized to the right upper quadrant. A urine sample is taken for rapid dipstick reagent strip analysis. A positive result for which of the following substances would most strongly suggest gallstone disease as a possible cause of her abdominal pain?

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