Analysis of the work quality in an active detection of pulmonary tuberculosis in 295 patients is presented. It was found out that in 62.7% of the cases a preventive screening had not guaranteed a timely detection of tuberculosis. It is resulted from a wrong interpretation of the lung pathology shown in an X-ray picture or its complete ignorance, absence of a regular double reading of fluorographic images, constant shortage of fluorographic films and presence of risk factors. The obtained information suggests that it should exercise a strict quality control over fluorographic examinations and their regularity.