Ketostix Reagent Strips The strips provide a fast, convenient way of testing urine for the presence and concentration of acetoacetic acid (ketone). This substance when found in the urine provides information on carbohydrate and fat metabolism. Acetoacetic acid can be found in the urine from diabetics and is more commonly referred to as a "ketone body." Use of Ketostix Reagent Strips can alert you and your to changes in your condition for which adjustments in your diet and/or medication may be needed. Carefully follow the testing schedule your doctor or educator establishes. Reagents: 7.1% w/w Sodium Nitroprusside; 92.9% w/w Buffer