The main way to detect whether the body is poisoned is through blood tests and liver functions. If the poisoning is caused by excessive heavy metals, the blood can be checked to see if there is poisoning through the testing of trace elements, and general poisoning can be diagnosed through blood tests and according to clinical symptoms. If it is pesticide poisoning, you can determine it by the odor emitted by the pesticide. In the case of benzene poisoning, the platelets, red blood cells, white blood cells, and hemoglobin of the poisoned person will produce abnormalities. The diagnosis of poisoning is not only based on blood tests but also on the exposure to toxic substances and clinical manifestations, such as vomiting, diarrhea, nausea and other symptoms in most cases of food poisoning, and liver function damage in severe cases.