Mercury, Serum/Plasma is a toxic heavy metal test that measures mercury levels in blood to evaluate exposure and potential toxicity. Mercury exposure can occur through consumption of certain fish, dental amalgams, occupational exposure, or environmental sources. This test is particularly valuable for evaluating patients with suspected mercury poisoning, monitoring individuals with occupational exposure, and assessing environmental exposure risks. Elevated mercury levels can cause various symptoms including neurological problems, kidney damage, gastrointestinal issues, and in severe cases, multi-organ failure. The test helps distinguish between recent exposure and chronic accumulation, guiding treatment decisions and exposure prevention strategies.