Symptoms of ketones in the urine include excessive thirst, frequent urination, nausea and vomiting, abdominal pain, and shortness of breath, states Mayo Clinic. Ketones develop when the body begins using fat instead of carbohydrates for energy, explains Healthline.
The body often draws energy from stored fats when the diet does not contain enough carbohydrates to supply the body with sugar for energy, explains WebMD.
Physicians often recommend that patients test their urine for ketones when blood glucose levels are greater than 300 milligrams per deciliter, according to Healthline. High levels of ketones in the urine could indicate diabetic ketoacidosis, a potentially life-threatening condition, warns WebMD.