Management of Elevated D-Dimer
Diagnostic Approach
- The American College of Chest Physicians recommends proceeding immediately with proximal compression ultrasound (CUS) of the femoral and popliteal veins as the definitive next diagnostic step when D-dimer is elevated 1, 2
- If proximal CUS is positive, initiate anticoagulation treatment immediately without waiting for confirmatory venography, as recommended by the American College of Chest Physicians 1, 3, 2
- For patients with low pretest probability, no further testing is required if the initial proximal CUS is negative, according to the American College of Chest Physicians 1, 4
- For patients with moderate or high pretest probability, repeat proximal CUS in 1 week to detect propagating distal thrombus, as recommended by the American College of Chest Physicians 1, 4, 3, 2
Special Considerations
- If proximal CUS is negative in patients with extensive unexplained leg swelling, image the iliac veins with CT venography or MR venography to exclude isolated iliac DVT, as recommended by the American College of Chest Physicians 5, 3, 2
- The American College of Chest Physicians recommends assessing for pulmonary embolism symptoms and proceeding with CT pulmonary angiography if present 2
- D-dimer should never be used alone to rule out DVT in patients with high pretest probability, according to the American College of Chest Physicians 4, 3
- In specific populations such as hospitalized patients, elderly patients, cancer patients, pregnant women, and those with inflammatory conditions, proceed directly to imaging rather than relying on D-dimer for exclusion, as recommended by the American College of Chest Physicians 7, 2