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ILO Classification
The ILO International Classification of Radiographs of Pneumoconioses is a system of classifying chest radiographs (X-rays) for persons with a (or, rarely, more than one) form of pneumoconiosis. The intent is to provide a standardized, uniform method of interpreting and describing abnormalities in chest x-rays that are thought to be caused by prolonged dust inhalation. In use, it provides a system for both epidemiological comparisons of many individuals exposed to dust and evaluation of an individual's potential disease relative to established standards.
==History==
Since 1946, the International Labour Organization〔(International Labour Organization )〕 has been a specialized agency of the United Nations, with objectives including establishing and overseeing international labor standards and labor rights. The International Labour Office ("ILO") is the Organization’s research body and publishing house. Since 1950, the ILO has periodically published guidelines on how to classify chest X-rays for pneumoconiosis. The purpose of the Classification was to describe and codify radiographic abnormalities of the pneumoconioses in a simple, systematic, and reproducible manner, aiding international comparisons of data, epidemiology, screening and surveillance, clinical purposes, and medical research. The most recent edition of the Guidelines,〔International Labour Office. ''International Classification of Radiographs of Pneumoconiosis'', rev ed. Occupational Safety and Health Series No. 22, Rev 2011. Geneva: ILO;2011; http://www.ilo.org/wcmsp5/groups/public/---ed_protect/---protrav/---safework/documents/publication/wcms_168260.pdf〕 completed in 2011, replaced the 2000 revised edition.〔International Labour Office. ''International Classification of Radiographs of Pneumoconiosis'', rev ed. Occupational Safety and Health Series No. 22, Rev 2000. Geneva: ILO;2000.〕
In 1974, after studies of surveillance programs for coal miners revealed unacceptable degrees of interreader variability,〔Felson B, Morgan WKC, Bristol LJ, et al. Observations on the Results of Multiple Readings of Chest Films in Coal Miners' Pneumoconiosis. ''Radiol'', 1973;109:19-23.〕 the National Institute for Occupational Safety and Health (NIOSH),began the "B" reader program (so named because of the ''Black'' lung or Coal Workers' X-ray Surveillance Program), with the intent to train and certify physicians in the ILO Classification system. The "B" reader certification examination〔Morgan RH. Proficiency Examination of Physicians for Classifying Pneumoconiosis Chest Films. ''Am J Radiol'', 1979;132:803-808.〕 went into full operation in 1978. A physician must pass the certification examination to be a "B" reader.
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