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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The Classification is based on a set of standard radiographs, a written text and a set of notes OHS No.

The object of the classification is to codify the radiographic abnormalities of pneumoconioses in a simple, reproducible manner. Acceptable, with no technical defect likely to impair classification of the radiograph of pneumoconiosis. Three sizes are defined by the appearances on standard radiographs: The relevant text from the earlier edition is reproduced in this edition, and the associated sets of standard radiographs remain available from clasisfication ILO.


Finally, other abnormal features of the chest radiograph can be commented upon ILO The 22 standard radiographs have been selected after international trials, in such a way as to illustrate the mid-categories standards of profusion of small opacities and to give examples of category A, B and C standards for large opacities.

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. Pleural abnormalities are also assessed with respect to location, width, extent, and degree of calcification.


Sincethe ILO has periodically published guidelines on how to classify radiographs for pneumoconioses External. 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 categories are defined in terms of the dimensions of the opacities. Categories 1, 2 and 3—increasing profusion of small opacities as defined by the corresponding standard radiographs.

The obliteration of the costophrenic angle should be systematically noted whether it exists or not. 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. Each new version of the classification promoted by the ILO has brought modifications and changes based on international experience gained in the use of earlier classifications.

Marked distortion of the intrathoracic organs. If a pleural thickening is circumscribed, it could be identified as a plaque. The Body Part II. Honeycomb lung appearance is not marked. The description of standard radiographs is given in table 1. Abnormality of cardiac size or shape.

ILO Classification

The purpose is to describe and codify radiographic abnormalities of pneumoconioses in a simple, systematic, and reproducible manner. Coalescence of small pneumoconiotic opacities.

Comments should be recorded pertaining to the classification of the radiograph, particularly if some other cause is thought to be responsible pneumoconiksis a shadow which could be thought by others to have been due to pneumoconiosis; also to identify radiographs for which the technical quality may have affected the reading materially.

From Wikipedia, the free encyclopedia.

ILO International Classification of Radiographs of Pneumoconioses (digital format)

Despite all the national and international energies devoted to their prevention, pneumoconioses are still very present both in industrialized and developing countries, and are responsible for the disability and impairment of many workers. Tadiographs of pleural thickening is defined in terms of the maximum length of pleural involvement, or as the sum of maximum lengths, whether seen in profile or face-on.


The experts made the suggestion that the short classification is of no advantage and can be deleted. Emphysema in upper zones. The zones in which the opacities are seen are recorded.

Sincethe International Labour Organization [1] has been a specialized agency of the United Nationswith objectives including establishing and overseeing international labor standards and labor rights. The pleural thickening present in profile, is of width a, and extent 2.

ILO Classification – Wikipedia

Occupational Safety and Health Series No. This is why the International Rqdiographs Office ILOthe World Health Organization WHO and many national institutes for occupational cor and safety continue their fight against these diseases and to propose sustainable programmes for preventing them.

The essential principle is that all appearances which are consistent with coassification defined and represented in the standard radiographs and the guideline for the use of the ILO International Classification, are to be classified. Discussion in particular at the Seventh International Pneumoconioses Conference, held in Pittsburgh inindicated the need for improvement of some parts of the classification, in particular those concerning pleural changes.

Use of the scheme may lead to better international comparability of pneumoconioses statistics. Category O—small opacities absent or less profuse than the lower limit of category 1.