stone_ureteral_score: STONE Score for Uncomplicated Ureteral Stone

In cliot: Clinical Indices and Outcomes Tools

STONE Score for Uncomplicated Ureteral Stone

Description

Calculates the STONE Score to predict the likelihood of an uncomplicated ureteral stone in patients presenting with flank pain. This score can help reduce radiation exposure by identifying patients with a high probability of ureteral stones who may not require immediate CT imaging.

Usage

stone_ureteral_score(sex, duration_of_pain_hours, race, nausea_vomiting,
                     hematuria_on_dipstick)

Arguments

sex	String. Patient sex ("Male" or "Female"). (Male adds 2 points).
duration_of_pain_hours	Numeric. Duration of pain prior to presentation in hours. <6 hours: +3 pts. 6-24 hours: +1 pt. >24 hours: 0 pts.
race	String. Patient race ("Black" or "Non_Black"). (Non-Black adds 3 points).
nausea_vomiting	Numeric (0, 1, or -1 if specified "none" but usually N/V is present vs absent). Here: Nausea alone = 1 pt, Vomiting = 2 pts, None = 0 pts. (Note: MDCalc implementation often simplifies to Nausea/Vomiting vs None, but original derivation uses graded points: Nausea +1, Vomiting +2). Wait, re-checking standard scoring: Nausea alone: 1 pt. Vomiting: 2 pts. None: 0 pts. Let's assume input 0=None, 1=Nausea, 2=Vomiting.
hematuria_on_dipstick	Numeric (0 or 1). Presence of hematuria on urine dipstick. (1 = Yes, +3 points).

Value

A list containing:

STONE_Score	The calculated total score (Range 0-13).
Risk_Category	Classification (Low, Moderate, High).
Ureteral_Stone_Probability	Estimated probability of ureteral stone presence.

References

Moore CL, Bomann S, Daniels B, et al. Derivation and validation of a clinical prediction rule for uncomplicated ureteral stone—the STONE score: retrospective and prospective validation. BMJ. 2014;348:g2191. doi:10.1136/bmj.g2191

Examples

# Example 1: High Probability
# Male (+2), Pain <6h (+3), Non-Black (+3), Vomiting (+2), Hematuria (+3)
# Score = 13
stone_ureteral_score("male", 4, "non_black", 2, 1)

# Example 2: Low Probability
# Female (0), Pain >24h (0), Black (0), No N/V (0), No Hematuria (0)
# Score = 0
stone_ureteral_score("female", 30, "black", 0, 0)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.