✍️ Written by the MedTestBD Editorial Team · Last reviewed: July 2026
What is the D-Dimer Test?
The D-Dimer test measures a small protein fragment that is released into the blood when a blood clot dissolves. When a clot forms in the body, the process of breaking it down produces D-dimer. Elevated D-dimer levels suggest that abnormal clotting activity is occurring somewhere in the body. It is most commonly used to rule out dangerous clotting conditions such as deep vein thrombosis (DVT) and pulmonary embolism (PE).
Why is the D-Dimer Test Done?
- To rule out deep vein thrombosis (DVT) — blood clots in the leg veins causing swelling and pain
- To rule out pulmonary embolism (PE) — a blood clot in the lungs causing sudden breathlessness and chest pain
- To evaluate disseminated intravascular coagulation (DIC) — a serious clotting disorder
- To monitor patients with known clotting disorders or those on anticoagulant therapy
- During COVID-19 illness, elevated D-dimer indicated severe disease and clotting complications
Normal D-Dimer Levels
| Result | D-Dimer Level | Interpretation |
|---|---|---|
| Normal | Below 500 ng/mL (0.5 mg/L FEU) | Clotting disorder unlikely |
| Elevated | Above 500 ng/mL | Further imaging needed to identify cause |
An elevated D-dimer does not confirm a clot — it is raised in many other conditions including infection, inflammation, pregnancy, surgery, and cancer. The D-dimer test is most useful as a rule-out test: a normal result makes a significant clot very unlikely. A high result requires follow-up with ultrasound or CT pulmonary angiogram.
How to Prepare for the D-Dimer Test
- No fasting is required
- Inform your doctor about blood-thinning medications (anticoagulants) you are taking, as they affect results
- Inform the doctor about recent surgery, injury, pregnancy, or active infection — all raise D-dimer independently
- A simple blood sample is drawn from a vein in your arm
- Results are usually available within a few hours and should be interpreted urgently if a PE or DVT is suspected
D-Dimer Test Price in Bangladesh
D-Dimer test prices vary between diagnostic centers across Bangladesh. Compare D-Dimer test prices on MedTestBD →
⚠️ This information is for general reference only. Always consult a qualified physician before undergoing any medical test.
