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Endocrine screening assays not only provide mechanistic information on the potential of a substance to interact with the endocrine system, but also data potentially relevant for risk assessment. However, these screening assays have a number of limitations that should be considered before the direct use of such data for risk assessment purposes. This paper discusses the limitations that should be considered for both human and environmental risk assessment. A proposal is made to provide an objective and transparent process in order to consider which endpoint(s) might be incorporated into a risk assessment, and when more definitive studies may be of value. The proposal is complemented with an easy-to-follow flowchart to aid industry scientists and regulators when evaluating the relevance of these data. Such an approach is necessary to ensure the appropriate use of screening data to further our understanding of the eco/toxicological profile of substances undergoing screening. [ABSTRACT FROM AUTHOR]