primary care rule for deep vein thrombosis

Introduction

A prediction rule that combine clinical features to predict deep vein thrombosis (DVT)

Indications

• used to assess need for ultrasound to rule out DVT

Clinical significance

• performs slightly better than the Well's rule for DVT
• rule misses 1.4% of DVTs identified by ultrasound

Procedure

Table

Variable	Points
male sex	1
presence of active malignancy	1
major surgery (within 3 months)	1
absence of leg trauma	1
dilated collateral veins (not varicose)	1
calf swelling >= 3 cm	2
positive plasma D-dimer	6

• a score of >=3 is positive

More general terms

• numerical rating scale (NRS)

Additional terms

• Wells clinical prediction rules for DVT