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Background: The diagnostic accuracy of the parent report of the Montgomery-angstrom sberg Depression Rating Scale (MADRS-P) for the screening of major depressive disorder (MDD) in adolescents has not been evaluated.Aim: The aim was to explore the psychometric properties and diagnostic accuracy of the MADRS-P in general child and adolescent psychiatric outpatient services in Sweden.Method: The study was a validation and a diagnostic accuracy study. Consecutive adolescent psychiatric patients (n=101, 45 males, mean age 15 years) were assessed with a diagnostic interview, the Kiddie Schedule of Affective Disorders and Schizophrenia for School-Age Children - Present and Lifetime version (K-SADS-PL), as a reference test. Thereafter, their parents reported on the MADRS-P. Both categorical MDD diagnoses and dimensional MDD symptom severity scores were obtained from the K-SADS-PL.Results: The internal consistency of the MADRS-P, measured with Cronbach's alpha, was 0.846. The concurrent validity, assessed by Spearman's rho as a correlation between the K-SADS MDD symptom severity score and the MADRS-P score, was 0.580. The area under the curve in a receiver operating characteristic analysis for all participants was 0.786 (95% confidence interval 0.694-0.877, p<.001). At a cut-off of 10, sensitivity was 0.86, specificity 0.54, positive predictive value 0.59 and negative predictive value 0.84.Conclusions: The parent-rated MADRS-P showed similar psychometric properties as previously shown for the self-rated MADRS-S in adults. Although the MADRS-P has acceptable diagnostic accuracy for screening for MDD in adolescents in a general psychiatric setting, it cannot be used alone for diagnosing MDD.