michigan_picc_risk_score: Michigan Risk Score for PICC-Related Thrombosis

In cliot: Clinical Indices and Outcomes Tools

Michigan Risk Score for PICC-Related Thrombosis

Description

Calculates the Michigan Risk Score to estimate the probability of symptomatic deep vein thrombosis (DVT) associated with the placement of a Peripherally Inserted Central Catheter (PICC). The score stratifies patients into four risk classes based on five clinical variables.

Usage

michigan_picc_risk_score(history_thrombosis, multilumen_catheter, active_cancer,
                         another_cvc_present, wbc_gt_12000)

Arguments

history_thrombosis	Numeric (0 or 1). History of Deep Vein Thrombosis (DVT). (1 = Yes, +2 points).
multilumen_catheter	Numeric (0 or 1). Is the PICC multi-lumen (2 or more lumens)? (1 = Yes, +1 point).
active_cancer	Numeric (0 or 1). Active cancer (treated within the last 6 months). (1 = Yes, +3 points).
another_cvc_present	Numeric (0 or 1). Is another Central Venous Catheter (CVC) present at the time of placement? (1 = Yes, +1 point).
wbc_gt_12000	Numeric (0 or 1). White Blood Cell count > 12,000 cells/mm^3 at the time of placement? (1 = Yes, +1 point).

Value

A list containing:

MRS_Score	The calculated total score (Range 0-8).
Risk_Class	Classification (Class I: 0, Class II: 1-2, Class III: 3, Class IV: >=4).
Est_Thrombosis_Risk	Estimated percentage risk of PICC-related thrombosis.

References

Chopra V, Flanders SA, Saint S, et al. The Michigan Risk Score to predict peripherally inserted central catheter-associated thrombosis. J Thromb Haemost. 2017;15(10):1951-1962. doi:10.1111/jth.13794

Examples

# Example 1: High Risk (Class IV)
# Active Cancer (+3), Multi-lumen (+1), WBC >12k (+1)
# Score = 5
michigan_picc_risk_score(0, 1, 1, 0, 1)

# Example 2: Low Risk (Class I)
# No risk factors
# Score = 0
michigan_picc_risk_score(0, 0, 0, 0, 0)

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