Dr.Colbert’s Ketone Test Strips are easy to use and clinically tested for accuracy. Clearly read results using the color chart on the vial or automated strip readers for quantitative results. These strips are available in many combinations, ranging from specific single tests to nine or ten parameter tests. Each unopened vial of 100 individual test strips has a long shelf life. See the chart on the specifications link below to select the test combinations to suit your needs. Low-carb dieters use our URS Ketone strips to monitor ketone output in urine, which can be an indicator of diet success. Test Principle: This test is based on the reaction of acetoacetic acid with sodium nitroprusside in a strongly basic medium. The colors range from beige or buff-pink color for a “Negative” reading to pink and pink-purple for a “Positive” reading. Results: Results are obtained by direct comparison of the color blocks presented on the bottle label. The color blocks represents normal values; actual values will vary around the normal values.