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Table 1 Summary of R.I.R.S. scoring system

From: The R.I.R.S. scoring system: An innovative scoring system for predicting stone-free rate following retrograde intrarenal surgery

  Score
  1 2 3
Renal stone density (Hu) ≤1000 >1000  
Inferior pole stone non-inferior inferior with RIPA > 30° inferior with RIPA ≤ 30°
RIL (mm) ≤25 >25  
Stone burden (mm) ≤10 >10 and ≤20 >20
  1. Range = 4~10 points