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Efficacy of computed tomography scout film and kidney ureter bladder radiograph in detecting urinary calculi. Introduction Urolithiasis is one of the most common urological conditions(Johnson, Wilson et al.). Currently, patients who present with features suggestive of urolithiasis are commonly investigated with non-contrast helical computed tomography (NCHCT) and XRay KUB simultaneously. NCHCT has been shown to be a superior investigation for urolithiasis, by being more sensitive than XRay KUB and intravenous urogram (IVU) (Johnston et al.). Conclusions Both XRay KUB and CT Scout film have a low sensitivity and specificity for detecting urolithiasis. They are not efficacious initial investigations. Almost all stones (98%) visible on scout film are also visible on XRay KUB. We therefore suggest that patients can initially undergo NCHCT and review of scout film. Stones that are visible on initial scout film can be followed up with XRay KUB. If stones are not visible initially on scout film, then a subsequent XRay KUB can be performed to determine whether the stone is visible- although the increase in detection would be low. These suggestions would minimise initial radiation exposure and cost. Results 113 urinary calculi were detected in 50 patients, with average an average width of 5.1mm. XRay KUB detected 54 (47.8%) stones while CT Scout film detected 43 (38%) (P