The diagnosis of lead poisoning includes clinical manifestations, medical history, blood lead test, urine lead test, lead repellent test, etc. It is recommended that people with similar clinical manifestations and medical history should consult the doctor promptly. 1. Clinical manifestations: After lead poisoning, the main manifestations are nausea and vomiting, abdominal cramps, abdominal distension, jaundice, twitching of limbs, insomnia and dreaminess, headache, and mental confusion. 2. Medical history: that is, to determine whether there is a history of lead exposure, such as long-term exposure to occupational environments containing lead, including lead mining and smelting, airbrushing, welding, oil painting, etc., as well as taking lead-containing medications, use of lead-containing containers and so on. 3. Blood lead test: This is to test the concentration of lead in the blood, which reflects the amount of lead in the body that produces harmful effects. Generally speaking, the increase in blood lead concentration occurs early and is stable, and the upper limit of the normal value of blood lead is 1.9 μmol/L. 4. 4. Urine lead test: It is to detect the concentration of lead in urine, but the level of urinary lead is easily affected by environmental factors, urine volume, kidney function, etc., and fluctuates greatly, and the upper limit of the normal value is 0.34μmol/L. 5. Lead repellent test: It is suitable for people who are suspected to have lead poisoning, but the urine lead test is normal, which is of great reference value for the diagnosis of lead poisoning and can reflect the lead load in the body. If there are symptoms of lead poisoning or suspected lead poisoning, it is recommended to go to the hospital immediately for further examination and timely detoxification treatment to avoid delaying the course of the disease and affecting the prognosis.