D-Dimer Assessment Results
75-year-old with mildly elevated D-dimer but low clinical probability
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Evidence-based calculations Used in clinical settings worldwide Regular monitoring recommended
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๐ด Elderly Low Risk
75-year-old with mildly elevated D-dimer but low clinical probability
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๐ฅ Post-Surgical Patient
Recent hip surgery patient with leg swelling and elevated D-dimer
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๐๏ธ Cancer Patient
Active cancer patient with dyspnea and high D-dimer
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โ Young Normal D-Dimer
Young patient with chest pain and normal D-dimer
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๐คฐ Pregnant with Leg Symptoms
Third trimester pregnancy with leg pain and elevated D-dimer
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Enter Patient Data
RequiredD-Dimer Values
Clinical Probability Assessment
VTE Risk Factors
Presenting Symptoms
For informational purposes only โ not medical advice. Consult a healthcare professional before acting on results.
๐ฅ Health Facts
โ WHO
โ CDC
What is Age-Adjusted D-Dimer?
D-dimer is a fibrin degradation product that is elevated when blood clots break down. It is highly sensitive for VTE (DVT and PE) but has low specificity, especially in elderly patients. The age-adjusted D-dimer threshold (Age ร 10 for patients โฅ50) improves specificity without sacrificing safety, reducing unnecessary imaging by up to 30%.
Pulmonary Embolism
Blood clot in pulmonary arteries causing dyspnea, chest pain, and hypoxia.
Deep Vein Thrombosis
Blood clot in deep leg veins causing swelling, pain, and warmth.
Safe Rule-Out
Negative D-dimer with low/moderate pretest probability safely excludes VTE.
How Age-Adjusted D-Dimer Works
Standard Threshold
For patients under 50 years
Age-Adjusted Threshold
For patients 50 years and older
When to Use D-Dimer Testing
โ Appropriate Use
- โข Low or moderate pretest probability for VTE
- โข To safely rule out PE or DVT
- โข Before proceeding to imaging
โ Not Recommended
- โข High clinical probability (go directly to imaging)
- โข To confirm VTE diagnosis
- โข As the only test for suspected PE/DVT
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