OBJECTIVE: A great proportion (50-70%) of patients with urinay incontinence (UI) do not ask for medical advise. Symptom questionnaires may help in detecting the UI. The objective of present study was to analize the psychometric properties of the Spanish version of the questionnaire of UI symptoms "ICIQ-SF". METHODS: A total of 500 women who consulted at a UI-specialized unit answered the questionnaire. Urodinamic study was carried out, and sociodemographic and clinical data were also collected including the symptoms expressed by the patients. So there were two diagnostic tools for the assessment: clinical and that of the urodinamic study. Feasibility, validity (comparing the scores between groups according to both diagnostic methods, between goups of different sort of UI and between groups of different severity degrees) and reliability (Cronbach´s alpha) were assessed. Sensitivity (Se), specificity (Sp), positive (PPV) and negative (NPV) predictive value with respect to clinical diagnostic and that of the urodinamic study were also calculated. RESULTS: Mean time of administration was 3 minutes. All patients answered all the items of the ICIQ-SF. According to clinical diagnostic, patients with UI showed higher score on the ICIQ-SF (11.6±5.9) than women without UI (4.5±6.3) (p = 0.000). The same occurs with the groups according to the urodinamic study (11.1±6.3 vs 6.2±6.5; p = 0.000). A higher severity degree was associated to a higher score on the ICIQ-SF: low degree (10.47±5.61) vs intermediate (12.4±5.72) vs high degree (13.61±5.42). Cronbach´s alpha was 0.89. The values of Se, Sp, PPV and NPV were 92.1%, 55.6%, 88.3% y 65.9% with respect to clinical diagnostic and 87.7%, 40.8%, 85.1% y 46.2% with respect to the urodinamic study. CONCLUSIONS: This is the first questionnaire design for diagnostic of UI validated in Spain. The psychometric properties of the ICIQ-SF are satisfactory and allow to recommend the use of the questionnaire in the clinical practice.