Age-Adjusted D-dimer Threshold for VTE
In patients ≥50 years with low-to-moderate pre-test probability of PE or DVT, D-dimer threshold is increased using the formula: age × 10 µg/L (or × 10 ng/mL). This increases specificity while maintaining sensitivity, reducing unnecessary imaging. Validated by ADJUST-PE and multiple meta-analyses.
Score interpretation
D-dimer below max(500, age × 10) µg/L with VTE unlikely: VTE can be excluded without imaging.
→ Consider alternative diagnoses.
D-dimer at or above the age-adjusted threshold.
→ Proceed to imaging (CTPA or proximal leg ultrasound).
With a 'likely' two-level Wells score a negative D-dimer does not exclude VTE (NICE NG158).
→ Proceed to imaging; interim anticoagulation if imaging is delayed.
Interpretation bands for the Age-Adjusted D-dimer. Apply clinical judgement and local guidance.
References
- Righini M et al. Age-adjusted D-dimer cutoff levels to rule out pulmonary embolism: the ADJUST-PE study. JAMA. 2014;311(11):1117–1124.
- NICE NG158. Venous thromboembolic diseases: diagnosis, management and thrombophilia testing. 2020 (updated 2023).
Related
Curated clinical cross-links plus same-class fallbacks.
- Nitric Oxide (Inhaled — iNO) · Selective Pulmonary Vasodilator
- Selexipag · Pulmonary Arterial Hypertension
- Macitentan · Pulmonary Arterial Hypertension
- Lissamine Green 1% Eye Drops · Vital Dye — Ocular Surface Staining (Dry Eye Diagnosis)
- Sildenafil (Paediatric — PPHN / PAH) · PDE5 Inhibitor (Paediatric Pulmonary Hypertension)
- Sildenafil · PDE5 Inhibitor — Pulmonary Arterial Hypertension
Decision support only — verify against a current formulary, NICE, or your local guideline before clinical use.