D-Dimer Blood Test

D-Dimer Test: quick answers

D-Dimer Test price

₹1,199, home sample collection

Normal range (adults)

Usual cut-off: Below 500 ng/mL FEU (0.5 microgram/mL FEU); Age-adjusted cut-off, over 50 years: Age in years multiplied by 10 ng/mL FEU

Done for

A doctor ruling out a clot in a leg vein (deep vein thrombosis) or the lung; Checking for widespread clotting problems in serious illness; Monitoring some people with COVID-19 or other severe infection, as a doctor advises

Fasting

Not required

Report

Same day / 24 hours

What is the D-Dimer Test?

The D-dimer test measures a fragment that is released when a blood clot breaks down. A normal result makes a dangerous clot in a leg vein or in the lung unlikely in people with low suspicion, while a high result only shows clotting activity and needs a doctor to look further.

D-Dimer Test normal range

Labs report D-dimer in different units (FEU or DDU, ng/mL or mg/L), and a DDU value is roughly half the FEU value. Use the cut-off printed on your report. Pregnancy, recent surgery, infection, cancer and older age all raise D-dimer without a clot.

Ranges differ between laboratories and methods. The reference range printed on your own report is the one to read your result against.

What your D-Dimer Test result means

Below the cut-off

In a person a doctor already thinks is at low or moderate risk, this makes a clot unlikely. It cannot be used alone when suspicion is high.

Above the cut-off

Shows that clotting and clot breakdown are happening. It does not say where or why. Many things raise it, so a doctor usually orders an ultrasound or scan to find out.

One result is not a diagnosis. A doctor reads it with your symptoms, history, medicines and other tests.

Why is the D-Dimer Test done?

• A doctor ruling out a clot in a leg vein (deep vein thrombosis) or the lung
• Checking for widespread clotting problems in serious illness
• Monitoring some people with COVID-19 or other severe infection, as a doctor advises
• Assessing the risk of a repeat clot after treatment stops
• Work-up of unexplained leg swelling or pain, together with a doctor's examination

What does the D-Dimer Test measure?

1 parameter. Expand a group to see the measurements, units and available method details.

The reference interval printed on your actual laboratory report governs interpretation. Intervals can vary by laboratory, method, age, sex and pregnancy. Methods can also vary by processing laboratory.

D-Dimer Test: sample & preparation

Sample: Blood. Fasting: Not required.

• No fasting is required. Tell the lab if you are pregnant, have recently had surgery, or have an infection or malignancy, as these can raise the result even without a blood clot.

Frequently asked questions