| Summary: | This study was ubdertaken to investigate the content validity of an instrument about knowledge on nasogastric intubation, based on the Pasquali model of content validation. Methods: methodological study developped with 23 nurses judges, teachers from public higher education institutions in the state of Rio Grande do Norte, by the application of Content Validity Index (CVI) and the Kappa index. The majority of the research judges were female (87%), age between 25 and 57 years-old, teaching time experience between 1 and 34 years and experience in the discipline of Nursing Semiology and/or Semiotics between 1 and 32 years. Of the total judges, 78.3% had master's degree as the maximum degree and 69.6% exercised exclusively the teaching. In the overall evaluation, the instrument obtained CVI values above 0.75, 0.94 the total CVI and 0.88 the total Kappa. However, some changes were made and focused on the requirements: vocabulary, clarity, updating and accuracy. The instrument showed reliability and trustworthy to observe the nursing care quality, however requires the resubmission of instruments to the same judges to retest, beyond its clinical application, for a more precise and specific content validation.
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