RESUMO
Cases included 90 workers occupationally exposed to lead for a period of 15 +/- 3.2 years. An equal number of controls were selected from workers who had never reported occupational expoure to lead. Levels of current as well as remote exposure to lead were higher among exposed compared to the controls. Total urinary protein levels were nearly the same in both groups but urinary alpha 1 microglobulin was significantly higher in the exposed group. The high levels of the alpha 1 microglobulin were positively correlated with blood lead levels, urinary sigma amino levulinc acid, hair lead concentrations and duration of exposure to lead. All lead exposure parameters as well as urinary alpha microglobulin returned back to levels comparable to those of the controls after cessation of exposure for 120 days