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STONE Nephrolithometry Score for Renal Calculi

Stone size in mm²
Length × width in mm
0-399 1
400-799 2
800-1599 3
>1600 4
Tract length (mm)
Distance from center of stone to the skin measured on CT film at 0°, 45°, and 90°
≤100 1
>100 2
Obstruction (hydronephrosis)
No/mild hydronephrosis 1
Moderate/severe hydronephrosis 2
Number of calyces with calculi
1-2 1
3 2
Full staghorn stone 3
Essence (stone density in Hounsfield units)
≤950 1
>950 2
Result:

Background

Result Interpretation

Ranges Ranges