Thomas et al reported the Guy's Stone Complexity Scoring System for patients with nephrolithiasis. The authors are from Guy's and St. Thomas' National Health Service Foundation Hospital in London.
Patient selection: nephrolithiasis
Parameters:
(1) number of stones
(2) anatomy
(3) staghorn calculus
(4) concurrent findings
Parameters |
Grade |
single stone, pelvis, simple anatomy |
I |
single stone, mid or lower pole, simple anatomy |
I |
single stone, upper pole, simple anatomy |
II |
multiple stones, simple anatomy |
II |
single stone, abnormal anatomy |
II |
multiple stones, abnormal anatomy |
III |
stone(s) in calyceal diverticulum |
III |
partial staghorn calculus |
III |
staghorn calculus |
IV |
any stone in a patient with spina bifida or spinal injury |
IV |
The grade correlates with stone-free rate following percutaneous nephrolithotomy (PCNL).
Specialty: Nephrology, Clinical Laboratory
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