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Objective: To evaluate the intra-rater and inter-rater reliability and internal consistency of the Danish version of the Loewenstein Occupational Therapy Cognitive Assessment, second edition (LOTCA-II/D), an instrument designed to assess and evaluate cognitive functioning. Methods: A reliability study was conducted at neurological acute care and rehabilitation units at three Danish hospitals. Fifty-four neurological patients participated in the study. Patients were tested with LOTCA-II/D by occupational therapists, and video recordings were made for reliability assessments. Intra-rater assessments were performed at least two weeks after the first assessment, and all occupational therapists were blinded to previous assessments. Intra-rater and inter-rater reliability were evaluated using percentage agreement and weighted kappa. Internal consistency was evaluated using Cronbach’s alpha, and floor and ceiling effects were evaluated by calculating the proportion of observations in minimum and maximum categories of subtests. Results: The results showed a lack of intra-rater and inter-rater reliability and a large variation of agreement due to a substantial ceiling effect. Internal consistency was below the acceptable value in half of the cognitive areas. Conclusion: The study found that LOTCA-II/D is not reliable in acute clinical practice, and it could thus not be validated for use in this setting.

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