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The blood lead threshold.

Until recently there was wide agreement that a threshold blood lead value existed below which clinical signs and symptoms of intoxication did not appear. The limit defined was one of 80 ..mu..g/100 g of blood for adults and 60 or 40 ..mu..g/100 g for children. There is evidence to show that these levels are too high; new maximum permissible limits are proposed for adults and for children. The main value of blood lead concentrations is to monitor abnormal exposure in a population rather than to serve as a major diagnostic tool.