The ILO International Classification of Radiographs of Pneumoconioses is a system of Since , the ILO has periodically published guidelines on how to classify chest X-rays for pneumoconiosis. The purpose of the Classification was to. ILO Classification The International Labour Organization (ILO) is a specialized agency of the Radiograph showing Simple Coal Workers’ Pneumoconiosis. The object of the classification is to codify the radiographic . defect likely to impair classification of the radiograph of pneumoconiosis. 3, Poor.

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For mixed shapes or sizes of small opacities, the predominant shape and size is recorded first. This is one example which explains why the ILO, in cooperation classifucation many experts, has developed and updated on a continuous basis a classification of radiographs of pneumoconioses that provides a means for recording systematically the radiographic abnormalities in the chest provoked by the inhalation of dust.

ILO International Classification of Radiographs of Pneumoconioses (digital format)

Part of this programme is based on medical surveillance which includes the reading of thoracic radiographs to help diagnose this pneumoconiosis. It is also used for radiogrzphs and recording, in a systematic way, part of the information needed for assessing compensation. Marked distortion of the intrathoracic organs. Kerley lines in lower right zone.

Monday, 28 February Radiogdaphs of the scheme may lead to better international comparability of pneumoconioses statistics. The ILO Classification system includes the printed Guidelines and sets of standard radiographs, available in both film and, as ofdigital forms.

The ILO does not take responsibility for content presented on this web portal that is presented in any language other than English, which is the language used for the initial production and peer-review of original content. The letters s, t and u denote the presence of small, irregular opacities. The first classification was proposed for silicosis at the First International Conference of Experts on Pneumoconioses, held in Johannesburg in Large opacities are defined as any opacity greater than 1 cm that is present in a film.


Enlargement of hilar or mediastinal lymph nodes. Poor, with some technical defect but still acceptable for classification purposes.


Both types may occur together. Final revisions to the latest edition were completed in ILO The purpose of the Classification was to describe and codify radigraphs 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.

In the continuing struggle to protect the health of workers occupationally exposed to airborne dusts, the ILO has for many years sought to improve the understanding of pneumoconiosis problems.

The categories are defined in terms of the dimensions of the opacities. Sincethe ILO has periodically published guidelines on how to classify chest X-rays for pneumoconiosis.

The ILO Classification system pertains to pulmonary parenchymal abnormalities small and large opacitiespleural changes pleural plaques, calcification, and diffuse pleural thickening and other features associated, or sometimes od, with occupational lung disease.

Not associated small calcifications.

Acceptable, with no technical defect likely to impair classification of the radiograph of pneumoconiosis. The experts made the suggestion that the short classification is of no advantage and can be deleted.

The reader compares the subject chest X-ray only the appearances seen on postero-anterior, or PA, chest x-ray with those of the standard set. They are then asked to categorize small opacities according to shape and size.


CDC – Chest Radiography: ILO Classification – NIOSH Workplace Safety and Health Topic

These are classified as classificarion A for one or more large opacities whose combined dimension does not exceed 5 cmcategory B for one or more large opacities whose combined dimension exceeds 5 cm but does not exceed the equivalent area of the right upper lung zoneor category C size is greater than category B. The Foreword to this revised edition defines the nomenclature used to distinguish different types of chest images.

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.

The standard films represent different types and severity of abnormalities and are used for comparison to subject films during the classification process. You will be subject to the destination website’s privacy policy when you follow the link.

ILO Classification

National Institute for Occupational Safety and Health. Definition of pleura is slightly imperfect.

The Guidelines for the use of the ILO International Classification of Radiographs of Pneumoconioses revised edition is the latest version of a well-established publication designed to standardize classification methods and facilitate international comparisons of pneumoconiosis statistics and research reports. Pleural abnormalities diffuse pleural thickening, plaques and obliteration of costophrenic angle are also illustrated on different radiographs.