When urine remains dark despite good hydration, it could indicate high levels of waste or pigments like bilirubin. Normally, the pigment urochrome gives urine its color, but persistent darkness may result from liver dysfunction (bilirubinuria), vitamin supplementation, or diets high in protein and low in carbs. If this lasts more than 48 hours, order an LFT and urinalysis. https://www.ncbi.nlm.nih.gov/books/NBK557439/ | https://www.merckmanuals.com/professional/hepatic-and-biliary-disorders/approach-to-the-patient-with-liver-disease/jaundice
