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If you are not in ketosis (or not following a keto diet), the urine ketone levels will be negative (given the absence of diabetes).

When following a keto diet, gradually, the urine ketone levels increase. Any level above negative (i.e., trace, moderate, or large) indicates that your body is metabolizing fat. Ketone levels of 0.5 to 3.0 millimoles per liter (mmol/L) indicate that you are in nutritional ketosis, which is generally the target of a keto diet. Remember that your urine ketone levels can change throughout the day, so it is helpful to check frequently.