Document EvagdwwMd3LnNxzwMDromnyKx

DEPARTMENT OF HEALTH AND HUMAN SERVICES PUBLIC HEALTH SERVICE CENTCR FOR OISCASC CONTROL RATIONAL INSTITUTK TO* OCCUPATIONAL 1AT1TN ANONOAtJR AOMNT A. TAM LAMNATONRt NNCOLIANIA ..AKITAT. CINCINNATI m Jnuyf 1981 A*for 1.0. No. 81135 Doar Hr. ' In response to your request to be notified of the results of the determination, of serum PCB levels, performed on blood drawn during the NIOSH survey of workers occupationally exposed to polychlorinated biphenyls in August 1977, we are providing the following information. Serum PCS levels, measured on blood drawn at the time of the survey, are reported here as 'lower chlorinated biphenyls " (L-PCBs) and 'higher chlorinated biphenyls' (H-PCBs). The L-PCBa ate predominantly biphenyl molecules with 4 or fewer chlorine atoms per molecule, and the H-PCBs are predominantly biphenyl molecules with $ or greater chlorine atoms per molecule. . I - the tine of the survey, your serum PCB levels werst ' Your serum level Highest levels found among persons without occupational exposure Lower chlorinated biphenyls (L-PCBsl Higher chlorinated biphenyls (H-PCBs) 180 ppb 31 PPb 30 ppb 10 ppb The 'highest levels found among persons without occupational exposure* were chosen since 97.5 percent of wotkers not occupationally exposed to peas at the two utility companies, who participated in the survey, had serins L-PCB and H-PCB levels less than these values. If you have any questions regarding these results, please do not hesitate to call ns in Cincinnati at (5131-814-3593. Sincerely yours, Alexander Blair Smith, M.D. . Medical Officer Medical Section Industrywide Studies Branch . Division of Surveillances Hasard ' Evaluationsp and Field Studies HONS 001525