Revision 10 for 'CT KUB'

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Computed tomography of kidneys, ureters and bladder (CT KUB) is a quick non-invasive technique for diagnosis of urolithiasis. It is usually considered the initial imaging modality for suspected urolithiasis in an emergency setting 1.

  • suspected urolithiasis 
  • hematuria 
  • flank pain
  • patient position
    • supine with their arms above their head
  • scout 
    • above the diaphragm to the below pubic symphysis 
  • scan extent 
    • above kidneys to below pubic symphysis 
  • scan direction
    • caudocranial
  • contrast injection considerations
    • non-contrast
  • scan delay
    • minimal scan delay
  • respiration phase
    • inspiration 


Practical points

  • prone has the advantage of assessing stones near the VUJ which may have just passed
  • some institutions may perform a limited pelvic scan in prone if the supine scan shows a calculus near the VUJ
  • stone composition assessment can be done with dual energy CT


  • identification of calcified renal tract calculi size and position
  • assessment of the sequelae of calculi
    • obstruction
    • infection
  • assessment of other causes of flank pain if negative for calculus disease
  • presence of further calculi at risk of obstructing

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