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Age-Adjusted D-Dimer Cutoff Levels to Rule Out Deep Vein Thrombosis
Grégoire Le Gal1,2, Helia Robert-Ebadi3, Venkatesh Thiruganasambandamoorthy1,4
1Ottawa Health Research Institute, Ottawa, Ontario, Canada.
JAMA
|January 6, 2026
Summary
The age-adjusted D-dimer cutoff safely rules out deep vein thrombosis (DVT) in patients with suspected leg DVT. This method increases the number of patients who can be effectively ruled out for DVT, especially older adults.
Area of Science:
- Vascular Medicine
- Diagnostic Imaging
- Clinical Pathology
Background:
- The conventional D-dimer cutoff for diagnosing deep vein thrombosis (DVT) has limitations, particularly in older adults.
- An age-adjusted D-dimer cutoff has shown promise in increasing diagnostic yield for pulmonary embolism but requires validation for leg DVT.
Purpose of the Study:
- To prospectively validate the safety and efficacy of an age-adjusted D-dimer cutoff in ruling out suspected leg deep vein thrombosis (DVT).
Main Methods:
- A multicenter, multinational prospective study involving 3205 outpatients with suspected DVT.
- Patients underwent assessment using the Wells score, a sensitive D-dimer test, and leg ultrasonography.
- Patients with ruled-out DVT were followed for 3 months to monitor for venous thromboembolic events.
Main Results:
- No DVT diagnostic failures occurred in patients with D-dimer levels between 500 µg/L and their age-adjusted cutoff.
- In patients aged 75 years and older, the age-adjusted cutoff increased the proportion of negative D-dimer results from 8.7% to 26.1% without false negatives.
- The age-adjusted cutoff allowed more patients to be safely ruled out for DVT.
Conclusions:
- The age-adjusted D-dimer cutoff is a safe and effective tool for ruling out deep vein thrombosis (DVT) in patients presenting with suspected leg DVT.
- This approach enhances diagnostic efficiency by increasing the number of patients who can be confidently excluded from having DVT, particularly in elderly populations.
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