Quick answer
The D-Dimer Test costs ₹1,400 at Live Line Health Care. Measures a clot breakdown fragment in the blood. No fasting is needed. It uses a blood sample and the report is usually ready the same day. Book home sample collection or visit any of our 45 centres.
Also known as: D Dimer, DDimer, Fibrin D-Dimer, Fibrin Degradation Fragment
What is the D-Dimer Test?
The D-Dimer test looks for a small protein fragment released when a blood clot breaks down. Whenever the body forms a clot and then dissolves it, pieces of cross-linked fibrin enter the bloodstream, and D-dimer is one of them. A healthy person has only a small amount. The level goes up when clotting and clot breakdown are active somewhere in the body, whether in a leg vein, in the lungs, or more widely during a serious illness.
The value of this test lies mainly in a normal result. If a doctor thinks a clot is not very likely, a normal D-dimer can help rule one out and avoid further scans. A high result does not prove that you have a clot, because levels also rise with age, pregnancy, surgery, injury, infection, COVID-19, cancer and liver disease. That is why a doctor needs to interpret it, and why an ultrasound or CT scan is often the next step. If you have sudden breathlessness, chest pain, coughing up blood or fainting, do not book a test: go to emergency care straight away.
What it measures: The level of D-dimer, a breakdown fragment of cross-linked fibrin, which indicates recent clot formation and breakdown in the body.
Parameters included (1)
- D-Dimer (ng/mL FEU)
Why is this test done?
- Helping rule out deep vein thrombosis (DVT) when a doctor thinks it is unlikely
- Helping rule out a lung clot (pulmonary embolism) in carefully selected patients
- Assessing disseminated intravascular coagulation (DIC), along with PT/INR, platelets and fibrinogen
- Following patients with serious infections, when the treating doctor asks for it
- Guiding decisions after a previous clot, when a specialist advises it
When should you get tested?
- Swelling, pain or warmth in one leg, which needs same-day medical review
- New one-sided calf pain after long travel, surgery or bed rest
- A previous clot, with a new concern raised by your doctor
- A request from your doctor during a serious infection or illness
- Sudden breathlessness, chest pain, coughing blood or fainting: go to emergency care, do not book a test
How to prepare for the D-Dimer Test
- 1See a doctor first if you have new leg swelling or pain. This test helps only when read along with a clinical assessment.
- 2No fasting is needed, and meals do not need to be timed around the sample.
- 3Tell staff about blood thinners and when you started them, as treatment can lower D-dimer.
- 4Mention pregnancy, recent surgery, injury or infection, all of which can raise the result.
D-Dimer Test normal range
| Parameter | Typical reference range |
|---|---|
| Usual cut-off | Below 500 ng/mL FEUthe same as 0.5 µg/mL FEU or 0.5 mg/L FEU |
| Age-adjusted cut-off above 50 years | Age × 10 ng/mL FEUfor example, 700 ng/mL at age 70; used by doctors in selected patients |
| If reported in DDU | Below about 250 ng/mL DDUa different unit from FEU |
D-dimer units differ between labs, and FEU and DDU are not the same, so always check the unit on your report. Ranges are typical adult values and vary between labs, age and sex. Always use the range printed on your report and discuss results with your doctor.
Understanding your results
- A normal D-dimer, in someone a doctor considers at low or moderate risk, makes a clot in the legs or lungs unlikely.
- A high D-dimer means more tests may be needed, often an ultrasound of the leg or a CT scan of the lungs. It does not prove that a clot is present.
- Levels rise naturally with age and as pregnancy advances, so doctors may use adjusted cut-offs or go directly to imaging in these groups.
- A very high level with low platelets, low fibrinogen and a prolonged PT can suggest DIC, a medical emergency managed in hospital.
- A normal value may be less reliable if you are already on a blood thinner or your symptoms began weeks ago, so your doctor may still advise a scan.
D-Dimer Test – FAQs
What is the price of the D-Dimer Test?
The D-Dimer Test costs ₹1,400 at Live Line Health Care, at all 45 centres and for home sample collection.
What does a high D-dimer mean?
It means clots are being formed and broken down somewhere in the body, but it does not show where or why. Besides DVT and lung clots, common causes include older age, pregnancy, recent surgery, infection and cancer. Your doctor will use your symptoms, and often a scan, to work out what it means.
Can a D-dimer test confirm a blood clot?
No. A high D-dimer cannot confirm a clot. Scans such as a leg ultrasound or CT pulmonary angiography do that. This test is best at ruling a clot out when a doctor thinks the risk is low, and it should not be used on its own for diagnosis.
Should I book this test for chest pain or breathlessness?
No. Sudden chest pain, severe breathlessness, coughing blood or fainting need emergency care right away, not a home or centre booking. Hospital teams can assess you, run this test if appropriate, and arrange scans and treatment without delay. Please call for help or go to the nearest emergency department.
Why is D-dimer high in pregnancy?
Pregnancy naturally raises clotting activity, and D-dimer climbs with each trimester. A level above the usual cut-off is therefore common and does not by itself mean a clot. If you have leg swelling or breathlessness while pregnant, seek care promptly. Your doctor will usually rely on scans suitable for pregnancy.
What is the difference between D-dimer and fibrinogen?
Fibrinogen is the raw material your body uses to build a clot. D-dimer is a fragment left behind after a clot is broken down. In serious clotting disorders such as DIC, fibrinogen usually falls while D-dimer rises, so doctors often read the two results together.
Why was D-dimer tested in COVID-19?
COVID-19 can increase clotting, especially in severe illness, so doctors used D-dimer to help judge severity and the chance of clots in hospital patients. A mild rise after recovery is not always meaningful. Testing after a mild infection is not routinely needed unless your doctor has a specific concern.
Where can I get the D-Dimer Test done?
At any of our 45 Live Line Health Care centres in 40 cities across Andhra Pradesh and Telangana, including Hyderabad, Visakhapatnam, Warangal, Kakinada and Nellore, or book home sample collection.
Medical disclaimer: This information is for general awareness only and is not a substitute for professional medical advice. Please consult a qualified doctor to interpret your results and before starting or changing any treatment.