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Michigan Risk Score for PICC-related thrombosis
Stratifies risk of upper-extremity DVT after peripherally inserted central catheter placement.
Michigan Risk Score for PICC-related thrombosis
Number of PICC lumens
History of venous thromboembolism
Active cancer
Another central venous catheter present when PICC placed
WBC count >12 x10^9/L at insertion
Result0 points
Risk class I - observed PICC-DVT rate about 0.9 %.
- Risk class
- I
- Thrombosis rate
- 0.9 %
When to use
- Estimating PICC-associated DVT risk to inform device selection, lumen number and surveillance.
Formula
Points: lumens (single 0 / double 1 / triple-quad 2 / >=5 3); prior VTE (>30d 2, <=30d 3); active cancer 3; other CVC 1; WBC >12 1. Class I=0, II=1-2, III=3-4, IV>=5.
Pearls and pitfalls
- Higher lumen counts and concurrent catheters are the most modifiable inputs.