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Principle: Test to determine the addition of glutaraldehyde. This reacts in an alkaline medium with nitroprussidnatrium to a violet colour complex.
Evaluation: Glutaraldehyde does not normally occur in urine. Traces of such in a urine sample, could indicate manipulation. A false-positive colour reaction of the test field is possible if ketone is present in the urine sample. This can occur if the individual suffers from a metabolic abnormality. In cases of hunger or extreme diets, ketone could show up in the urine sample. In these cases, the ketone test field shows an obvious violet colour after 30-60 seconds.
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