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🧪 Age-Adjusted D-dimer Threshold (VTE)

UseWhen to use: after a validated unlikely/low–intermediate pre-test probability for PE or DVT, before imaging.

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StrataBelow cut-off in an appropriate pathway lowers VTE likelihood; at/above cut-off does not confirm VTE — procee…

LimitsWhen not to use: high pre-test probability, pregnancy algorithms that… · Pitfall: using age-adjustment without Wells/Geneva (or equivalent) pr… · Do not use D-dimer alone to exclude VTE in high-probability patients.

SourceESC acute PE guideline (tool-page edition); China PTE 2018 on zh pages

Runs locally in your browser (no PHI uploaded). For licensed clinicians — not a substitute for clinical judgement.
Stored on this device for revisit reminders

This-shift next steps

After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.

Scene next step
📋vte dxOpen scene pack →
Related scores
Matching pathway
🧭dvt_dxOpen pathway →
Score + version; reference only — not a substitute for care · no HIS write

Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.

Methodology · worked example, guidelines & full notes
Clinical takeaway

Age × 10 only if age > 50.

When to use

When to use: after a validated unlikely/low–intermediate pre-test probability for PE or DVT, before imaging.

How it works

Cut-off = 500 µg/L FEU if age ≤ 50; otherwise age (years) × 10 µg/L FEU.

Key points

  • Age × 10 only if age > 50.
  • FEU units (DDU ≈ half FEU — convert carefully).
  • Next: Wells PE/DVT, PERC, then CTPA/duplex as indicated.

References

Worked calculation

The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.

Age72 years
D-dimer result (optional)680 µg/L FEU

→Age-adj. cut-offBelow cut-off

  • Age-adjusted cut-off：720 µg/L FEU
  • Rule：age (years) × 10 µg/L FEU
  • Measured D-dimer：680 µg/L FEU
Verification & sources · governance
FAQ

Frequently asked questions

Does Age-Adjusted D-dimer Threshold (VTE) upload patient data? Where is it calculated?
Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
How is Age-Adjusted D-dimer Threshold (VTE) calculated in practice? Can you show a worked example?
Inputs: Age 72 years, D-dimer result (optional) 680 µg/L FEU → Result: Age-adj. cut-off Below cut-off（Age-adjusted cut-off: 720 µg/L FEU, Rule: age (years) × 10 µg/L FEU, Measured D-dimer: 680 µg/L FEU）
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