👉 Diacetonuria is a condition in which a person's kidneys are unable to remove excess nitrogen from their blood. This can lead to high levels of urea, which is an amino acid that is excreted in urine. In general, diacetonuria occurs when the body has difficulty filtering out excess nitrogenous waste products, such as nitrogen and ammonia, from the bloodstream. The kidneys are responsible for removing these waste products from the blood, but if they cannot do so effectively, it