Product Review

Reagent Strips for Urinalysis Checks: (1) In Vitro Measurement of Urine Vitamin C (2) pH (3) Ketone Merit-Check 3 strips are designed for in vitro measurement of urine Vitamin C, pH and Ketones. Test results may provide information regarding the status of carbohydrate metabolism, kidney and liver function, acid-base balance, and bacteriuria. Merit-Check 3 strip are packaged along with a drying agent in a plastic bottle with a twist-off cap. Each strip is stable and ready to use upon remove from the bottle. The entire reagent strip is disposable. Results are obtained by direct comparison of the test strip with the color blocks printed on the bottle label. No calculations or laboratory instruments are required. TEST PRINCIPLE: Ketones: this test is based on the reaction of acetoacetic acid with sodium nitroprusside in a strongly basic medium. The colors range from beige to buff-pink color for a "Negative" reading to pink-purple for a "Positive" reading. pH: this test is based on the well known double pH indicator method, where bromothymol blue and methyl red give distinguishable colors over the pH range of 5-9. The colors range from red-orange to yellow and yellow-green to blue-green. Ascorbic Acid/Vitamin C: this test is based on the action of a complex chelating agent with a polyvalent metal ion in its higher state and an indicator dye that can react with the metal ion in its lower state to product a color change from blue-green to yellow.