wells_dvt_score: Wells' Criteria for DVT

In cliot: Clinical Indices and Outcomes Tools

Wells' Criteria for DVT

Description

Calculates the Wells' Criteria risk stratification score for Deep Vein Thrombosis (DVT). The score classifies patients into 'Likely' or 'Unlikely' probability groups to guide diagnostic testing (e.g., D-dimer vs. Ultrasound).

Usage

wells_dvt_score(active_cancer, paralysis_paresis, bedridden_recently_surgery,
                localized_tenderness, entire_leg_swollen, calf_swelling_gt_3cm,
                pitting_edema, collateral_superficial_veins, history_dvt,
                alternative_diagnosis_likely)

Arguments

active_cancer	Numeric (0 or 1). Active cancer (treatment ongoing, within 6 months, or palliative). (1 = Yes, +1 point).
paralysis_paresis	Numeric (0 or 1). Paralysis, paresis, or recent plaster immobilization of the lower extremities. (1 = Yes, +1 point).
bedridden_recently_surgery	Numeric (0 or 1). Recently bedridden > 3 days or major surgery within 4 weeks requiring general or regional anesthesia. (1 = Yes, +1 point).
localized_tenderness	Numeric (0 or 1). Localized tenderness along the distribution of the deep venous system. (1 = Yes, +1 point).
entire_leg_swollen	Numeric (0 or 1). Entire leg swollen. (1 = Yes, +1 point).
calf_swelling_gt_3cm	Numeric (0 or 1). Calf swelling > 3 cm compared to the asymptomatic leg (measured 10 cm below tibial tuberosity). (1 = Yes, +1 point).
pitting_edema	Numeric (0 or 1). Pitting edema confined to the symptomatic leg. (1 = Yes, +1 point).
collateral_superficial_veins	Numeric (0 or 1). Collateral superficial veins (non-varicose). (1 = Yes, +1 point).
history_dvt	Numeric (0 or 1). Previously documented DVT. (1 = Yes, +1 point).
alternative_diagnosis_likely	Numeric (0 or 1). Alternative diagnosis at least as likely as DVT. (1 = Yes, -2 points).

Value

A list containing:

Wells_Score	The calculated score (Range -2 to 9).
Risk_Category	Classification (Unlikely <2, Likely >=2).
Probability	Estimated prevalence of DVT in the risk group.

References

Wells PS, Anderson DR, Bormanis J, et al. Value of assessment of pretest probability of deep-vein thrombosis in clinical management. Lancet. 1997;350(9094):1795-1798. doi:10.1016/S0140-6736(97)08140-3

Examples

# Example 1: DVT Likely
# Cancer (+1), Swelling >3cm (+1), Tenderness (+1)
# Score = 3
wells_dvt_score(1, 0, 0, 1, 0, 1, 0, 0, 0, 0)

# Example 2: DVT Unlikely
# Recent surgery (+1), but alternative diagnosis likely (-2)
# Score = -1
wells_dvt_score(0, 0, 1, 0, 0, 0, 0, 0, 0, 1)

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