Mercury (Hg) Level analysis, by Atomic Absorption Spectrophotometer Flame and GFA mode, is used to determine the concentration of mercury in various samples, such as blood, urine, or tissues. Mercury is a toxic substance that can seriously impact health, so this analysis is important for assessing exposure levels. The technique used in the analysis involves measuring the absorption of mercury by light, providing high accuracy in determining the levels. This test is commonly used in industrial settings, as well as in assessing environmental exposure, such as consumption of contaminated fish. This analysis helps doctors and researchers make informed decisions about public health and potential risks associated with mercury exposure.