The aim of this study was to investigate the clinical functioning of one of the dimensions of the Dimensional Clinical Personality Inventory (IDCP), Attention Seeking, and to establish a cutoff considering the diagnosis of histrionic personality disorder, whose pathological characteristics are directly related to this dimension. The IDCP was applied to 1954 participants (62.20% women), between 18 and 90 years (M = 29.30, SD = 11.38), divided into three groups: patients with histrionic personality disorders (n = 14), patients with other personality disorders (n = 168), and those without diagnoses (n = 1772). The parameters of items and persons were estimated by the rating scale model, and reliability measures were generated, as well as the item-person map and map of items, ANOVA for comparison between groups, and ROC curve. The results suggest suitability of the Attention Seek dimension in clinical functioning; however, problems that seem inherent to the histrionic personality disorder were reflected in the setting of the dimension.