Which reaction detects urobilinogen on urine dipsticks?

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Urobilinogen in urine is detected using the Ehrlich reaction. In this test, urobilinogen reacts with Ehrlich's reagent (paradimethylaminobenzaldehyde) in acidic solution to form a pink to red chromogen on the dipstick. This color change signals the presence and amount of urobilinogen, which helps evaluate liver function and possible hemolysis. The other tests mentioned target different substances—reducing sugars, aldehydes, and peptide bonds—which is why they aren’t used for detecting urobilinogen.