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==Evaluation==
[[File:CT measurement of kidney stone in soft tissue and bone window.jpg|thumb|Measurement of a 5.6 mm large kidney stone in soft tissue window (at left, with width of 400 HU, and center at 50 HU) versus skeletal window (right, W1800,C400). 145 HU is regarded as an appropriate cutoff to distinguish a stone from surrounding tissue.<ref name="LidénThunberg2015">{{cite journal|last1=Lidén|first1=Mats|last2=Thunberg|first2=Per|last3=Broxvall|first3=Mathias|last4=Geijer|first4=Håkan|title=Two- and three-dimensional CT measurements of urinary calculi length and width: a comparative study|journal=Acta Radiologica|volume=56|issue=4|year=2015|pages=487–492|issn=0284-1851|doi=10.1177/0284185114528490}}</ref>]]
Proper sizing of a stone is important at around 5 mm and above, since smaller stones generally pass spontaneously.<ref name="Size1" group="note"/> Sizing of larger stones is also important in order to decide which treatment to choose.<ref name="Size2" group="note"/>
