Low Diagnostic Yield of KUB for Suspected Nephrolithiasis in Urgent Care: A Retrospective Quality-Improvement Audit

Background

Plain radiography of the kidneys, ureters and bladder (KUB) is frequently ordered in urgent care for suspected Renal Calculi, despite a reported sensitivity and specificity of only 44–77%, well below non-contrast computed tomography (CT), which current guidelines treat as the diagnostic standard.