What does urine routine ketone body positive 1+ mean?

A positive urine ketone 1+ indicates a slightly higher urine ketone concentration than normal.

Ketones are compounds produced by fat metabolism that are not normally present in urine. A positive urine ketone 1+ indicates a certain amount of ketones detected in urine samples, which may indicate that the body is breaking down fat for energy rather than sugar or other carbohydrates from food. This result may be caused by prolonged skipping meals, low-carb diets, alcohol abuse, diabetes, etc.