PURPOSE: Chest x-rays (CXR) are the most frequent radiological tests performed in the intensive care unit (ICU). Proposed advantages of daily routine CXR are early detection & thus earlier treatment of clinically unsuspected abnormalities, documentation of disease progression and response to therapy, and detection of complications associated with indwelling devices. Proposed disadvantages include, variable interpretation of CXR depending on clinician and patient factors, low incidence of clinically unsuspected abnormalities, potential harm arising from unnecessary treatment of minor or false positive findings, cost, radiation exposure and adverse events arising from repositioning of the patient to obtain the CXR. Anecdotal reports suggest that more routine daily CXR are performed in the Allegheny General Hospital (AGH) medical intensive care unit (MICU) than what is necessary. A review of the literature suggests (and a consensus statement by the American College of Radiology concurs) that routine daily chest radiographs in the ICU are not indicated. The American Thoracic Society also agrees that routine chestradiography is rarely indicated and may be harmful. Unexpected findings on chest radiographs were noted in <6% of the 2457 daily routine radiographs ordered in 754 consecutive ICU patients in a mixed medical-surgical ICU. The unexpected CXR findings prompted a change in management in less than half of these cases. Stable patients are particularly unlikely to benefit from routine chest radiography. Our mission was to determine if routine daily CXR is beneficial in the MICU and to determine how often the CXR prompted a major intervention.