Copper analysis (Copper - Cu) using an atomic absorption spectrophotometer with flame and graphite furnace (GFA) mode is a test used to accurately measure copper levels in blood or urine. Copper is an essential element for vital body functions, but excess or deficiency can indicate health disorders, such as Wilson’s disease or copper deficiency. The flame absorption mode is used to measure higher concentrations, while the graphite furnace mode provides greater accuracy for lower concentrations. This test helps diagnose and monitor metabolic disorders and metal poisoning.