The Copper test measures the level of copper in the blood or urine. Copper is an essential trace element that plays a vital role in various bodily functions, including the formation of red blood cells, maintaining nerve function, and supporting the immune system. Abnormal copper levels can be indicative of various health conditions. Low copper levels may suggest copper deficiency, which can lead to anemia, bone abnormalities, and immune system issues. High copper levels can be associated with Wilson’s disease, a genetic disorder that causes copper accumulation in tissues, potentially leading to liver and neurological damage.