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D-Dimer: normal range & what your result means

D-dimer is a fragment released when a blood clot breaks down. It is mainly used to help rule OUT a clot (DVT or lung clot) when suspicion is low.

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Typical adult reference range

Measure	Range
Normal	< 0.5 µg/mL FEU (< 500 ng/mL)
Raised	> 0.5 µg/mL FEU

What a HIGH result can mean

A raised D-dimer can indicate a clot, but also rises with infection, inflammation, surgery, pregnancy and age — so it is not specific

What a LOW result can mean

A normal D-dimer, with low clinical suspicion, helps safely rule out a clot

Ranges vary by lab. Reference ranges are TYPICAL ADULT values and vary by laboratory, age, sex, pregnancy and the method used. Always read your result against the range printed on YOUR report, and let your doctor interpret it alongside your history.

Frequently asked questions

What does a high D-dimer mean?

It suggests clot breakdown is happening somewhere, but many non-clot causes (infection, surgery, pregnancy) also raise it. A high result usually leads to imaging to look for a clot.

Can a normal D-dimer rule out a clot?

When the clinical suspicion is low, a normal D-dimer makes a DVT or pulmonary embolism very unlikely and can avoid further scans.

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MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.