国内目前常用的铅中毒筛选指标有尿铅、尿ALA和尿棕色素等,国外还用血铅和血中游离红细胞原卟啉的测定。实践表明,以上各指标都有一定价值,但也存在不少问题,主要都在实验室进行,要有一定的试剂,费用较贵,有些操作特别复杂,采样到出报告需隔几天。此外,测定尿铅,血铅还易受环境中铅的污染而影响结果的准确性。近年来,国外使用携带 The most commonly used indicators of lead poisoning in the country are urinary lead, urinary ALA, and urinary brown pigment. Foreign blood erythrocyte porphyrin is also measured by blood lead and blood. Practice shows that the above indicators have some value, but there are also many problems, mainly in the laboratory, there must be some reagents, more expensive, some operations are particularly complex, take a few days to sample the report. In addition, the determination of urinary lead, blood lead is also susceptible to lead contamination in the environment and affect the accuracy of the results. In recent years, foreign use to carry