If you experience possible symptoms, test your ketone levels right away. In addition, you should always test your urine if, after testing your blood, you discover that your glucose is higher than 240 mg/dl. Continue to test at least every four to six hours. If you are sick, you should also test your ketone levels every four to six hours.
To test your ketones, use a urine test strip. Immerse the reagent pad of the test strip into a glass container of your urine. (Ensure that the container is clean and dry before filling it.) Remove it immediately, position the strip horizontally, and wait. In approximately 15 seconds, the color on the strip will change. Compare the color with the color chart (available with the testing kit) to determine the approximate level of ketones.