Which test is used to detect reducing sugars like glucose in urine for screening diabetes mellitus?
Answer and explanation
Correct answer: D. Benedict test
- Step 1: Benedict's qualitative reagent contains copper sulfate, sodium carbonate, and sodium citrate. Step 2. Reducing sugars reduce Cu2+ to insoluble brick-red Cu2O precipitate upon boiling, providing a colorimetric clinical urine screen. Answer: Benedict's test (or Fehling's test). Why not the others: Biuret tests proteins; Ninhydrin tests amino acids; Lucas tests alcohols.
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