For healthcare professionals
Age-adjusted D-dimer calculator
D-dimer rises with age, so a fixed 500 μg/L cutoff turns positive in many older patients without pulmonary embolism (PE). The age-adjusted cutoff is age × 10 μg/L (FEU) from age 50. In a patient with a nonhigh clinical probability, a D-dimer below it rules PE out. This tool is written for clinicians and is not a diagnosis.
Patient details
For adults with suspected acute PE. Nothing you enter leaves this page.
What you will see
The D-dimer cutoff for this age and unit, and whether the result rules PE out or calls for imaging.
Educational only, not medical advice. A cutoff does not replace clinical judgment.
Source
The ADJUST-PE study by Righini and colleagues, JAMA 2014 (cited, not quoted), with the cutoff rule as printed in Roy and colleagues, JAMA Cardiology 2021 (CC BY) and Diagnostics 2023 (CC BY 4.0), and in Fatah and colleagues, Research and Practice in Thrombosis and Haemostasis 2026 (CC BY). The tests check the cutoff under 50, at 50, the 73-year worked example, the DDU version and values exactly at the cutoff.
Validated in
ADJUST-PE included 3346 patients with suspected PE in 19 emergency departments in Belgium, France, the Netherlands and Switzerland, with 6 D-dimer assays. Clinical probability was assessed with the revised Geneva score or the two-level Wells score (Fatah 2026, Roy 2023).
Limits
Only for a nonhigh clinical probability: with a high probability the strategy goes to imaging. Not validated with every D-dimer assay: Fatah and colleagues note more than 30 commercial assays and call for assay-specific validation. Check whether your laboratory reports FEU or DDU. Evidence for deep vein thrombosis is more limited. Only values below the cutoff rule PE out; a value exactly at the cutoff does not.
The rule
- Assess the clinical probability first, for example with the revised Geneva score or the two-level Wells score. The rule applies only when the probability is not high (Roy 2021) (Roy 2023).
- Under 50 years: the conventional cutoff of 500 μg/L (0.5 mg/L) FEU applies.
- From age 50: the cutoff is age × 10 μg/L FEU (age × 0.01 mg/L). A 73-year-old has a cutoff of 730 μg/L (Fatah 2026).
- A D-dimer below the cutoff rules PE out. A D-dimer at or above it calls for imaging (CT pulmonary angiography or a ventilation/perfusion scan) (Roy 2021).
How the sources word the start age. Roy and colleagues 2021 print, in a table footnote, a cutoff of less than 0.5 μg/mL for patients younger than 50 years and age × 0.01 μg/mL for patients 50 years or older; their Methods section says older than 50 years (Roy 2021). Roy and colleagues 2023 write before and after the age of 50 years (Roy 2023). Fatah and colleagues write starting from age 50 years and, for ADJUST-PE, over 50 years (Fatah 2026). At exactly 50 every version gives 500 μg/L, so the result does not change.
D-dimer units (DDU). Some assays report D-dimer units rather than fibrinogen equivalent units. Fatah and colleagues give the HemosIL D-dimer HS example: its conventional cutoff is 250 μg/L DDU, equal to 500 μg/L FEU, so the age-adjusted cutoff in DDU is age × 5 (Fatah 2026).
What the studies found
Fatah and colleagues summarize ADJUST-PE (Righini 2014): 500 μg/L was used under 50 years and age × 10 μg/L over 50 years. In patients over 75, the share of negative D-dimer tests rose from 6.4% to 29.7%. The overall false-negative rate was 0.3% (95% CI 0.1% to 1.7%), within the International Society on Thrombosis and Haemostasis safety margins (Fatah 2026).
Roy and colleagues 2023 report that 331 of the 3346 patients (10%) had a D-dimer above 500 μg/L but below age × 10 μg/L, and one of them had a thromboembolic event during follow-up (0.3%, 95% CI 0.1% to 1.7%) (Roy 2023).
Fatah and colleagues also list societies that recommend the age-adjusted cutoff for PE exclusion in patients over 50, including NICE, the European Society of Cardiology, the American College of Emergency Physicians and the American Society of Hematology. They note that the European Society of Cardiology limits it to ELFA and immunoturbidimetric assays (Fatah 2026).
Related tools
Assess the clinical probability with the Wells score for PE or the revised Geneva score. When the gestalt probability is already low, the PERC rule calculator checks the 8 rule-out criteria without a D-dimer. The YEARS algorithm uses a 1000 or 500 ng/mL cutoff by the number of items, and the 4PEPS score uses the age-adjusted cutoff for its moderate level. Other bedside scores are listed under For healthcare professionals.
Sources
- Roy PM, Friou E, Germeau B, Douillet D, Kline JA, Righini M, Le Gal G, Moumneh T, Penaloza A. Derivation and validation of a 4-level clinical pretest probability score for suspected pulmonary embolism to safely decrease imaging testing. JAMA Cardiol. 2021;6(6):669-677. doi:10.1001/jamacardio.2021.0064. PMID 33656522. Open access (CC BY). Table 3 (4PEPS items, points and levels) and Table 1 (D-dimer step per level). pmc.ncbi.nlm.nih.gov/articles/PMC7931139/
- Roy PM, Moumneh T, Bizouard T, Duval D, Douillet D. How to combat over-testing for patients suspected of pulmonary embolism: a narrative review. Diagnostics (Basel). 2023;13(7):1326. doi:10.3390/diagnostics13071326. PMID 37046544. Open access (CC BY 4.0). Table 2 (4PEPS items, points and levels). pmc.ncbi.nlm.nih.gov/articles/PMC10093278/
- Fatah T, Catella J, Nougier C, Rezigue H. Raising the D-dimer bar: a narrative review of the age-adjusted D-dimer threshold. Res Pract Thromb Haemost. 2026;10(1):103255. doi:10.1016/j.rpth.2025.103255. PMID 41509550. Open access (CC BY). Sections 2 and 3 (age × 10 μg/L from age 50, the ADJUST-PE design and results, DDU assays age × 5, assay validation). pmc.ncbi.nlm.nih.gov/articles/PMC12775812/
- Righini M, Van Es J, Den Exter PL, et al. Age-adjusted D-dimer cutoff levels to rule out pulmonary embolism: the ADJUST-PE study. JAMA. 2014;311(11):1117-1124. doi:10.1001/jama.2014.2135. PMID 24643601. Original study (cited; the rule and results used here are taken from Roy 2021, Roy 2023 and Fatah 2026, CC BY). doi.org/10.1001/jama.2014.2135
Written and maintained by the uncovermyrisk.com editorial team. We do not have a medical reviewer; every claim links to its primary source above. Last reviewed: 2026-11-03. Spotted an error? See About.