Dark urine

Urine whose color is abnormally deep yellow, amber, brown, tea-colored, or cola-colored, reflecting increased concentration or the presence of pigments such as bilirubin, hemoglobin, myoglobin, melanin, drugs, or dietary breakdown products.

Causes

• Dehydration

• Hepatobiliary disease (bilirubinuria)

• Hemolysis (hemoglobinuria/hematuria)

• Rhabdomyolysis (myoglobinuria)

• Porphyria

• Drugs (metronidazole, antimalarials, laxatives)

• Dietary factors (fava beans, rhubarb)