Samwel Mikaye: Understanding D-Dimer in Clinical Practice
Samwel Mikaye, Medical Doctor at MSK, shared a post on LinkedIn:
”What is D-Dimer?
D-dimer is a protein fragment produced when a blood clot is broken down in the body. It is normally undetectable or very low in the blood, but levels rise when the body forms and breaks down clots.
It is used primarily as a lab test to help rule out clotting disorders.
Common Uses of D-Dimer Test
- Suspected Deep Vein Thrombosis (DVT) – Clots in deep veins, usually in legs.
- Pulmonary Embolism (PE) – Clots in the lungs.
- Disseminated Intravascular Coagulation (DIC) – Abnormal widespread clotting and bleeding.
- Sometimes used to monitor clot breakdown in known clotting conditions.
Interpretation
- Normal/Low D-dimer → Clotting disorder unlikely.
- High D-dimer → Suggests recent or ongoing clot formation and breakdown, but not specific. Many conditions can raise D-dimer:
- Infection
- Inflammation
- Recent surgery or trauma
- Liver disease
- Cancer
Important: A high D-dimer does not confirm a clot. Imaging (like Doppler ultrasound or CT scan) is usually needed to diagnose DVT or PE.
Advantages
- Quick blood test.
- Good for ruling out clots in low-risk patients.
Limitations
- Non-specific – many conditions can raise it.
- Not useful alone to diagnose a clot.
- Less reliable in elderly patients or those with chronic illnesses.
Think of D-dimer as a ‘smoke alarm’: a high level signals something may be wrong with clotting, but you need further tests to find the fire (actual clot).”
Other posts featuring Samwel Mikaye on Hemostasis Today.
-
Jun 26, 2026, 10:59Wolfgang Miesbach: How Clonal Hematopoiesis May Explain Age-Related Mitochondrial Mutations
-
Jun 26, 2026, 10:52Chinua Onyebuchi: The Future of Stroke Care in Africa Lies in Strong Health Systems
-
Jun 26, 2026, 10:35Habtamu Milkias Wolde: New Insights into Stroke and Traumatic Brain Injury from Global Burden of Disease Data
-
Jun 26, 2026, 10:19Rytis Masiliūnas: Atrial Fibrillation and Stroke Care Disparities Across the Baltic Region
-
Jun 26, 2026, 10:11Kayla Kilani: First-Ever CT Perfusion Scan Performed Inside a Mobile Stroke Unit
-
Jun 26, 2026, 07:38Baraa Nassar: High Clinical Suspicion Is Essential for Early Diagnosis of CVST
-
Jun 26, 2026, 07:10Saleh Shamse Basha: Why APTT Alone Can Be Misleading During UFH Monitoring
-
Jun 26, 2026, 06:01Nicolas Hubacz: A Sharper Look at the Brain’s Vascular Landscape
-
Jun 26, 2026, 05:57Ayse Bahar Keleşoğlu Dinçer: New Insights into Antiphospholipid Syndrome Classification and Recurrent Thrombosis Risk