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INTRODUCTION Lung cancer is one of the leading causes of death worldwide and in Cuba, where its incidence and mortality are on the rise. Diagnostic delay is a variable linked to survival and prognosis. Quantifying this delay and comparing it with data from other national and international sources may lead to planning actions to reduce its impact. OBJECTIVE Assess diagnostic delay of lung cancer in patients at the Joaquín Albarrán Clinical-Surgical Teaching Hospital, Havana, Cuba, from 2007 to 2010. METHODS A retrospective descriptive study was conducted based on administrative data from patients diagnosed with lung cancer. The length of overall diagnostic delay was determined, as well delay between symptom onset and the patient's fi rst contact with the health system, and delay at the primary and secondary levels of the national health system. Descriptive statistics were used to summarize the different time intervals. RESULTS The study comprised a total of 54 patients; 74.1% were men; the largest age group was 51-60 years. Of the total, 61.1% sought care first at the primary level. Total diagnostic delay for these patients was 67.4 days: 24.3 days due to patient delay (SD 32.8), 16.2 days due to primary care delay (SD 5.2), and 26.9 days due to secondary care delay (SD 20.1). The total delay for patients first seen at the secondary care level was 79.1 days (SD 81.8): 47.8 days due to patient delay (SD 25.6), and 31.3 days due to secondary level delay (SD 14.4). CONCLUSIONS Diagnostic delay in lung cancer is high. Patients who went directly to hospital did not benefit from shorter delay in diagnosis. [ABSTRACT FROM AUTHOR]