This descriptive study was conducted in two phases: (1) construction of an initial nursing diagnosis for RDCO based on the opinion of experts and (2) content validity of RDCO using the Fehring model for diagnostic content validity (DCV) (Fehring, 1987). This model was developed based on the need for nurses to examine and determine the relevance of the components of a nursing diagnosis using complex statistical analysis and expert opinion and judgements. Besides, its relevance lies on identify and evaluate the level to which a cluster of signals, symptoms or specific conditions (defining characteristics or risk factors) occurs in clinical practice, according to experts judgement.