Introduction The utility of Mobile Crisis Unit (MCU) and its target population has been a controversial issue and many scientific articles have been writen about it (1,2). Objective The aim of this study is to identify the demographic and clinical features of patients diagnosed with psychotic disorder who have been hospitalized and have not required hospitalization in psychiatric unit through a Mobile Crisis Unit (MCU). Methods We collected retrospectively demographic and clinical variables. These include psychiatric rating scales of severity: Clinical Global Impression Scale (CGI) and Psychiatric Disease Severity (GEP); of functionality as Global Assessment of Functioning Scale (GAF); the aggressive behaviour and violence scale (AVAT) and psychopathology with the Positive and Negative Syndrome Scale (PANSS) of a total of 136 patients between June 2007 and July 2010. Results There have been found stadisticaly significative differences between patients who have been hospitalized versus patients who have not in the items of treatment adherence and security staff intervention (Table 1). There is a positive correlation between patients who required hospitalization and the clinical scales CGI, GEP, GAF, AVAT, SUMD, PANSS-P and PANSS-G (Table 2). Conclusions We can conclude that patients cared for by the Mobile Crisis Unit (MCU) that require of psychiatric hospitalization have poor adherence to previous treatment. A high frequency of cases require intervention of security staff for having a higher risk of aggressiveness at the moment of hospitalization. The presence of greater psychopathology and functionality severity in patients hospitalized through the Mobile Crisis Unit (MCU) is also considered. Variables No hospitalization Hospitalization p N % N % Sex Men 33 54.1 41 54.7 0.95 Cohabitation Alone 15 24.6 25 33.3 0.27 Toxics Yes 14 23 17 22.7 0.97 Psychiatric history Yes 45 78.9 54 77.1 0.81 Previous hospitalizations Yes 42 68.9 42 56 0.12 Treatment adherence Yes 14 31.1 2 3.5 Security staff Yes 1 1.7 39 57.4 Chi-square Variables No hospitalization Hospitalization p Age 45,3(17,02) 45,44(16,16) 0,96 CGI 4,24(0,82) 5,11(0,67) GEP 12,09(4,18) 15,96(3,82) GAF 47,16(14,21) 37,07 (23,72) AVAT 2,41 (1,98) 4,15 (2,45) SUMD 10,65 (3,29) 12,97 (3,08) PANSS P 22,28(7,02) 28,79(6,43) PANSS N 21,89 (8,44) 20 (8,09) 0,19 PANSS PG 38,8 (9,51) 45,28 (9,65) Mean(SD)–T-test