A urine copper test measures the amount of copper excreted in the urine over a specific period, usually 24 hours. Copper is an essential mineral needed for enzyme function, iron metabolism, and nervous system health, but excess copper can be toxic.
Diagnosing Wilson’s Disease (Excess Copper Storage)
Wilson’s disease is a rare genetic disorder where copper builds up in the liver, brain, and other organs due to a defect in copper excretion.
A high urine copper level (>100 mcg/24 hours) is a key diagnostic marker.
Assessing Copper Toxicity (Heavy Metal Poisoning)
Elevated urine copper may indicate copper poisoning from contaminated water, industrial exposure, or excessive supplement intake.
Monitoring Treatment for Wilson’s Disease
Patients with Wilson’s disease are treated with copper-chelating medications (like penicillamine or trientine).
Urine copper levels help track treatment effectiveness.
Evaluating Liver Diseases
Liver disorders like chronic hepatitis or cirrhosis can impair copper metabolism, leading to increased urinary copper excretion.
24-hour urine collection is the standard method.
A random urine sample may be taken in emergencies but is less reliable.
24-Hour Urine Copper: 10–30 mcg/24 hours
Wilson’s Disease: >100 mcg/24 hours
Copper Toxicity: Can exceed 200 mcg/24 hours
Serum Copper: Measures copper in the blood but may be low in Wilson’s disease due to copper being trapped in organs.
Ceruloplasmin: A protein that carries copper; it is low in Wilson’s disease but can be high in infections and inflammation.
Liver Biopsy for Hepatic Copper: May be needed for a definitive diagnosis of Wilson’s disease.