A urine acetoacetate level of 40 mg/dL or above likely indicates a blood ketone level of 1 mmol/L or higher.

“unless you're running kind of dehydrated you know if you have a normal hydration state and your urine acetoacetate is 40 milligrams per deciliter or above you are probably hitting 1 millimolar or above if you're anywhere between 40 and 80 - I think 160 milligrams per deciliter so you're in a state of ketosis”