Over the past few years, continuous development in the field of contrast mediums in the computed tomography has been observed. For this reasons, it is important, for radiographers to have a knowledge/information on the side effects of the contrast mediums, and that they recognize the risk factors for a contrast medium induced nephropathy. This paper examines the knowledge of radiographers and academic years of RT 16, RT17, RT 18W about contrast medium induced nephropathy. Included are the types of the contrast mediums used in computed tomography, the control of the blood parameters, the factors that influence the compatibility of the contrast medium, the definition of contrast medium and the measures of prevention. The aim of this study is to provide an overview of any potentially existing differences between the knowledge of radiographers and that of RT-students. To collect this data, a questionnaire in the period of 31-03-16 to 25-04-16 was conducted. The questionnaire results were compared with the researched literature. By analysis of the questionnaire, it has been shown that more than 50% of both surveyed groups do not know the definition of contrast medium induced nephropathy. In practice, this means that radiographers do not know the correct definition of contrast medium induced nephropathy, but the respondents have knowledge on the methods for prevention of contrast medium induced nephropathy, and these methods will be enforced.