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The Positive and Negative Syndrome Scale (PANSS) is one of the most commonly used assessment tools for measuring psychotic symptoms. The Psychotic Symptom Rating Scales (PSYRATS) is another instrument created specifically to assess delusions and auditory hallucinations. However, research on the concurrent validity of PSYRATS with PANSS is limited. There are also inconsistent findings regarding the association between the PSYRATS scales and the PANSS positive scale. The present study aims to add to the understanding of the concurrent validity of these measures, while also incorporating a broader measure of psychiatric symptoms (the symptom scale from the Global Assessment of Functioning Scale – split version, GAF-S). Spearman's Rank Order Correlations (rho) were calculated for scores from the PANSS positive scale, PSYRATS and GAF-S in a sample of 148 participants with psychotic disorders at three time points. The findings indicate concurrent validity between PSYRATS and PANSS, while the PSYRATS scales were not consistently correlated with GAF-S. PSYRATS may be a valid assessment tool for evaluating psychotic symptoms. The utility of PSYRATS in research and clinical practice should be investigated further. [ABSTRACT FROM AUTHOR]