Arsenic is a toxic heavy metal test that measures arsenic levels in blood to evaluate exposure and potential toxicity. Arsenic exposure can occur through contaminated water, food, occupational exposure, or certain medications. This test is particularly valuable for evaluating patients with suspected arsenic poisoning, monitoring individuals with occupational exposure, and assessing environmental exposure risks. Elevated arsenic levels can cause various symptoms including gastrointestinal issues, neurological problems, skin changes, and in severe cases, multi-organ failure. The test helps distinguish between recent exposure and chronic accumulation, guiding treatment decisions and exposure prevention strategies.