Ketonuria is not associated with which condition?

• A. Diabetes mellitus
• B. Lactating cows
• C. Starvation
• D. Hemolysis

Answer: (D)

Ketonuria happens when ketone bodies build up in the urine because the body is relying on fat for fuel when carbohydrate supply or insulin action is limited. In diabetes mellitus, lack of insulin drives fat breakdown and ketone production, so ketones appear in the urine. In starvation or prolonged fasting, carbohydrate stores are depleted and fat becomes the main energy source, producing ketones that are excreted. In dairy cows experiencing early lactation, the energy demand is high and intake may not meet needs, leading to negative energy balance and ketone formation.

Hemolysis, by contrast, is the destruction of red blood cells. It can cause hemoglobin or other byproducts to appear in urine, but it does not generate ketone bodies, so ketonuria is not associated with hemolysis.