Thallium (TI) level analysis using Atomic Absorption Spectrophotometry (AAS) with Flame and Graphite Furnace Atomization (GFA) modes is a laboratory test used to determine thallium concentrations in blood or urine samples. Thallium is a toxic metal, and exposure to it can lead to a range of health symptoms, including poisoning. The sample is collected and then analyzed using advanced techniques, ensuring high precision in the results. This analysis helps doctors assess cases of poisoning or exposure to heavy metals and is an essential tool in monitoring public health, especially in environments exposed to pollutants. Clinical applications of this test include diagnosing occupational or environmental exposure and guiding appropriate treatment.