International blood lead diagnostic criteria: equal to or greater than 100 micrograms/liter, it is lead poisoning.
Normal blood lead level: 0--99 micrograms/liter (L).
100-199 micrograms/L is lead poisoning.
200-249 micrograms/L is mildly poisoned.
250-449 micrograms/ is moderately poisoned.
Equal to or higher than 450 micrograms/L is severely poisoned.
Children's blood lead standard
Children's hyperleademia and lead poisoning should be diagnosed based on the children's venous blood lead level.
Hyperleademia: The venous blood lead level for two consecutive times is 100～199ug/L;
Lead poisoning: two consecutive venous blood lead levels are equal to or higher than 200ug/L; and according to the blood lead level, it is divided into mild, moderate and severe lead poisoning.
Mild lead poisoning: blood lead level is 200～249ug/L;
Moderate lead poisoning: blood lead level is 250～449ug/L;
Severe lead poisoning: blood lead level is equal to or higher than 450ug/L;