Age-Adjusted D-Dimer Threshold for PE
Calculates the age-adjusted D-dimer threshold for excluding PE in patients over 50. Reduces unnecessary CTPA in elderly patients with low-to-moderate pre-test probability. Formula: age × 10 μg/L.
Score interpretation
D-dimer below max(500, age × 10) µg/L with PE unlikely on the two-level Wells score (≤ 4): PE can be excluded without imaging (ADJUST-PE; NICE NG158). This does not apply when PE is clinically likely.
→ CTPA not required. No anticoagulation needed. Pursue alternative diagnoses.
D-dimer at or above the age-adjusted threshold. PE not excluded.
→ Proceed to CTPA. Consider empirical anticoagulation if high pre-test probability and imaging delayed > 4h.
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.
Related
Curated clinical cross-links plus same-class fallbacks.
- Nitric Oxide (Inhaled — iNO) · Selective Pulmonary Vasodilator
- Selexipag · Pulmonary Arterial Hypertension
- Macitentan · Pulmonary Arterial Hypertension
- Bisoprolol (Heart Failure in Elderly) · Selective beta-1 blocker
- Sodium Valproate (Epilepsy in Elderly) · Antiepileptic
- Sertraline (Elderly) · SSRI Antidepressant
- Acute Asthma in Adults · BTS/SIGN British Guideline on Asthma 2019; NICE NG80
- Pulmonary Embolism Assessment · NICE NG158; ESC 2019 PE Guidelines
- Acute Exacerbation of COPD (AECOPD) · NICE NG115; GOLD 2024
- Spontaneous Pneumothorax (Adult) · BTS Pleural Disease 2023
- Atypical Pneumonia (Legionella / Mycoplasma / Chlamydophila) · BTS 2023; IDSA
- COPD Exacerbation Management · NICE NG115 / GOLD 2024
Decision support only — verify against a current formulary, NICE, or your local guideline before clinical use.