From the hospitals, data to assess the health care costs were taken from the 26 patients' files, discharges registers, and hospital administration registers. Access to medical files was approved by the directors of the health facilities. For the analysis of health care costs, the study considered only people of working age (women aged 18-60 years and men aged 18-65 years ) whose diagnosis was associated with a work-related poisoning. All cases were seen and treated at public hospitals under coverage by the National Health Fund (Fondo Nacional de Salud (FONASA)), which covers 76.5% of the regional population. Cases from the private insurance system were not considered because private providers refused to give information Health care costs were estimated using the microcosting methodology, looking into the different kinds of care/services provided to every person treated .The cost was measured on the basis of invoiced care services registered at each of the hospitals. Data to determine the package of health care services were completed by the review of medical files. The items that were considered for valuation, when hospitalization was required, were medical consultation at emergency room, day-bed at intensive care unit, day-bed in general medical ward, kinesiology sessions, ambulance transport, diagnosis support (laboratory, electrocardiogram, x-ray), and medication . For those who were not hospitalized , medical records showed that no diagnostic support was provided (x-ray, laboratory work);medical consultation at emergency room, medicines,and others pharmaceutical items were included for valuation in the investigation . The costs of the medical items were estimated from the prices defined each year by FONASA, published in the official Gazette on January 28, 2013. As for the medicines, values were obtained from average prices that every hospital considered when purchasing medicines in the first quarter of the year 2013. For all costs, the considered currency rate was 472.62 Chilean pesos per US $1,as of January 15, 2013