This analysis measures the concentration of elemental silver (Ag) in a hair sample. Hair is a biological storage tissue that captures and retains minerals from the bloodstream as it grows (approximately 1 cm per month). The silver level in hair reflects moderate to long-term exposure (2–3 months prior) and can be an indicator of endogenous accumulation resulting from environmental or occupational exposure, or excessive consumption of silver-containing supplements (such as colloidal silver).