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D-Dimer Test

⚠️ Update approaching🔬 Evidence: StrongHematology
Diğer adları: D dimer, D-dimer level, Fibrin degradation product
⚠️

Discuss your test results with your doctor. This page is for informational purposes only and does not provide a diagnosis.

⚡ Key Facts

• A protein fragment released when blood clots break down • Primarily used to rule out clotting events (DVT, PE) • In an appropriate clinical setting, a normal result makes active clotting unlikely • Many non-clot conditions can elevate D-dimer

🧪 What Does This Test Measure?

The D-dimer test measures a protein fragment produced when blood clots are broken down by the body's fibrinolytic system, primarily used to rule out DVT and pulmonary embolism.

📋 Why Is It Ordered?

Primarily ordered to rule out DVT and pulmonary embolism. Also used in DIC evaluation and monitoring of clotting disorders.

🔧 Preparation

Fasting is generally not required. A venous blood sample is collected. Result turnaround time may vary.

📊 Reference Ranges

Normal: <500 µg/L (FEU) or <250 µg/L (DDU) Age-adjusted threshold (≥50 years): age × 10 µg/L (FEU) ⚠️ Units and thresholds vary by assay method.

⬆️ High Values

Elevated D-dimer may be associated with DVT, pulmonary embolism, DIC, or other clotting processes. Many non-clot conditions also elevate D-dimer.

⬇️ Low Values

A low or normal D-dimer level suggests that active clot formation and breakdown is unlikely. In an appropriate clinical setting, this makes active DVT/PE unlikely.

⚙️ What Can Affect Results?

Age, pregnancy, infection, surgery, cancer, anticoagulant medications, and assay method may affect D-dimer results.

🔬 Evidence Summary

Strong evidence: 3 guidelines, 1 systematic review, and 3 observational studies.

📚 Most Important Studies on This Topic

1

2026 AHA/ACC/ACCP/ACEP/CHEST/SCAI/SHM/SIR/SVM/SVN Guideline for the Evaluation and Management of Acute Pulmonary Embolism in Adults

Guideline· Circulation · 2026 · PMID: 41712677

2

Diagnostic accuracy of conventional or age adjusted D-dimer cut-off values in older patients with suspected venous thromboembolism: systematic review and meta-analysis

Systematic review· BMJ · 2013 · PMID: 23645857

3

Age-adjusted D-dimer cutoff levels to rule out pulmonary embolism: the ADJUST-PE study

Observational· JAMA · 2014 · PMID: 24643601

✅ Key Takeaways

💡

What you learned: D-dimer is primarily a clot exclusion test. A normal result makes active clotting very unlikely; an elevated result requires further investigation.

⛔

An elevated D-dimer alone does not confirm a clot. Imaging and clinical assessment are needed for diagnosis.

🔬 Sources Used on This Page

7 sources · Most recent publication: 2026
📋
Guideline
Expert society and guideline recommendations
3
sources
📊
Systematic review / meta-analysis
Combined analysis of multiple studies
1
source
👁
Observational
Observational and cohort studies
3
sources
Overall assessment: Evidence level for this topic is strong. This page is supported by 3 guidelines, 1 systematic review/meta-analysis, 3 observational studies.

📝 Questions to Ask Your Doctor

Be prepared for your appointment. Add questions to your list.

📋 References

[PMID: 41712677] 2026 AHA/ACC/ACCP/ACEP/CHEST/SCAI/SHM/SIR/SVM/SVN Guideline for the Evaluation and Management of Acute Pulmonary Embolism in Adults. Circulation, 2026.
[PMID: 41490105] Age-Adjusted D-Dimer Cutoff Levels to Rule Out Deep Vein Thrombosis. JAMA, 2026.
[PMID: 31504429] 2019 ESC Guidelines for the diagnosis and management of acute pulmonary embolism developed in collaboration with the ERS. European Heart Journal, 2019.
[PMID: 31774957] Diagnosis of Pulmonary Embolism with D-dimer Adjusted to Clinical Probability. New England Journal of Medicine, 2019.
[PMID: 24643601] Age-adjusted D-dimer cutoff levels to rule out pulmonary embolism: the ADJUST-PE study. JAMA, 2014.
[PMID: 23645857] Diagnostic accuracy of conventional or age adjusted D-dimer cut-off values in older patients with suspected venous thromboembolism: systematic review and meta-analysis. BMJ, 2013.
[PMID: 11816725] Towards definition, clinical and laboratory criteria, and a scoring system for disseminated intravascular coagulation. Thrombosis and Haemostasis, 2001.
Last reviewed: 4/2/2026
Next review: 4/2/2027

⚖️ Comparisons

D-Dimer vs Fibrinogen→

🔗 Related Topics

🧪 CRP (C-reaktif protein)🧪 Hemogram (tam kan sayımı)🧪 PT/INR (protrombin zamanı)🧪 aPTT (aktive parsiyel tromboplastin zamanı)🧪 Fibrinojen
⚖️ This page does not replace medical advice. Make treatment decisions with your doctor.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.