尿粪卟啉又称尿棕色素。正常人由于接触铅等毒物时,尿中可有粪卟啉排出。而肝脏病、血液系统疾病以及服用阿斯匹林和非那西汀等药物,均可引起粪卟啉增高。因此,尿卟啉不一定与尿铅含量呈平行关系,但其半定量阳性程度与铅中毒程度有平行关系。 尿卟啉的阳性检出率与放置时间有一定的关系。一般采用放置半小时至两小时观察结果。有人主张,可疑标本放置十二小时至二十四小时。我们认为,前者阳性漏检甚多,后者 Urinary coproporphyrin, also known as urinary brown pigment. Normal people due to exposure to lead and other poisons, urine may have coproporphyrin excretion. Liver disease, blood diseases and taking aspirin and phenacetin and other drugs, can cause increased coproporphyrin. Therefore, urinary porphyrin is not necessarily parallel with the urine lead content, but its semi-quantitative positive degree and lead poisoning degree has a parallel relationship. Urine porphyrin positive detection rate and placement time have a certain relationship. Generally used for half an hour to two hours to observe the results. Some people claim that suspicious specimens are placed for twelve hours to twenty-four hours. We think the former has a lot of positive missed tests, the latter