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Ruling out deep venous thrombosis in primary care. A simple diagnostic algorithm including D-dimer testing.

Ruud Oudega¹, Karel G M Moons, Arno W Hoes

¹Julius Center for Health Sciences and Primary care, University Medical Center, Utrecht, The Netherlands. R.Oudega@knmg.nl

Thrombosis and Haemostasis

|August 23, 2005

Summary

A new diagnostic rule using eight indicators can safely exclude deep vein thrombosis (DVT) in primary care. This improves efficiency, reducing referrals and healthcare costs for suspected DVT patients.

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Area of Science:

Internal Medicine
Diagnostic Medicine

Background:

Referral rates for suspected deep vein thrombosis (DVT) in primary care are high, with low confirmation rates (20-30%).
Inefficient diagnostic work-ups for DVT place a burden on patients and healthcare budgets.

Purpose of the Study:

To develop and validate a simple diagnostic decision rule for primary care physicians.
To enable safe exclusion of DVT without referral, improving diagnostic efficiency.

Main Methods:

A cross-sectional study of 1295 consecutive patients presenting with DVT symptoms in primary care.
Identified independent diagnostic indicators including patient history, physical examination, and D-dimer test results.

Main Results:

Eight key indicators were identified: male gender, oral contraceptive use, malignancy, recent surgery, absence of leg trauma, vein distension, calf difference, and D-dimer result.

Related Experiment Videos

Applying the rule could reduce referrals by at least 23%, with a missed DVT rate of only 0.7%.

Conclusions:

A simple 8-indicator rule can safely rule out DVT in primary care.
Implementation can significantly reduce unnecessary referrals, patient burden, and healthcare costs.