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铅中毒诊断指标很多,各有优缺点。由于尿铅存在种种缺点,国外多用血铅来代替。但我国目前受仪器条件所限,原子吸收分光光度计等在普及上尚有困难。代表机体血红素合成受损的尿δ-氨基酮戊二酸(δ-ALA)和尿粪卟啉(CP-U)等指标则要在血铅达到40μg/100ml以上时才出现阳性结果。δ-氨基酮戊二酸脱水酶(δ-ALA-D)是铅吸收非常灵敏的指标,但对诊断铅中毒意义不大。
Lead poisoning diagnostic indicators are many, each have their own advantages and disadvantages. Because of the shortcomings of urinary lead, foreign blood lead instead. But our country is limited by the instrument condition at present, atomic absorption spectrophotometer, etc. Still have difficulty in popularizing. Indicators of body hemoglobin synthesis damage δ - aminoketone glutamate (δ-ALA) and urine coproporphyrin (CP-U) and other indicators will be in the blood lead to 40μg / 100ml or more positive results. Delta-aminoketone glutarate dehydratase (δ-ALA-D) is a very sensitive indicator of lead uptake, but it is of little significance for the diagnosis of lead poisoning.