Copper Urine Test in California

What this test measures

This test quantifies copper excreted through the kidneys, which reflects both dietary intake and the body's regulation of copper stores. Copper is essential for iron metabolism, connective tissue formation, and nerve function, but too much or too little can cause health problems. Urine measurement captures how much copper is being cleared over time. Some protocols use a random sample, while others require a timed collection for a more complete view.

A urine sample is collected in a clean container at a partner laboratory. When a timed collection is requested, all urine produced over the collection period is saved according to the laboratory instructions. Copper is measured with methods such as mass spectrometry, and creatinine may be reported so the result can be adjusted for urine concentration. Measuring copper in both blood and urine often provides the most useful picture.

People order urine copper testing when a provider suspects a metabolic disorder affecting copper storage or excretion, when nutritional copper deficiency is being investigated, or when monitoring a condition over time. The test supports clinical evaluation rather than standing alone. A qualified healthcare provider should interpret the results with your history, symptoms, and any related blood or liver tests.