ketones, or DKA can be a reflection of blood sugar that has been too high for a prolonged period of time. Often when you have the flu a person will see ketones as well. Here's a blog by our pediatric diabetologist, Dr. Cogan, but it is a great explanation of DKA and what steps need to be taken whether you are a child or adult:
http://www.healthcentral.com/diabetes/c/651280/43280/ketoacidosis
You should most definitely talk with your doctor as soon as you can.
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