The Serum Copper test measures the amount of copper circulating in your bloodstream. Copper is an essential trace mineral that is vital for brain function, energy production, and forming connective tissue. This test is critical for diagnosing Wilson's disease (a condition of copper overload) and for identifying copper deficiencies. A simple blood draw is all that is required. This test provides a clear, quantitative look at your body's copper balance, which is essential for proper neurological and metabolic health.