The burden of a kidney stone is determined by its size.


burden of a single stone =

= 0.785 * (maximum length in mm) * (maximum width in mm)



• 0.785 = PI()/4

• The equation is for the cross-sectional area of an ellipse.


total stone burden =

= SUM(stone burden for all stones present)


The higher the total stone burden the more severe the nephrolithiasis.


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