What is KUB use in lithiasis dx?

- Very easy to perform in an emergency. However of poor sensitivity and specificity in providing evidence of the presence of a calculi (40 to 58% and 60 to 77% respectively). - Therefore, KUB should not be done in isolation (alone) and should be coupled with another imaging test. - Moreover, it only informs about the presence of a stone and not about the possible complications. - Calculi are considered opaque to x-rays (radiography), or simply radiopaque, when they are seen on KUB. - Calculi are considered radiolucent (radio-transparent) when they are only visible on echography (ultrasound). Radiolucent (radio-transparent) calculi are seen on the scanner. - When the calculus is visualized on the KUB, it can be used to follow the progress of the calculus.