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D-dimer µg/mL → ng/mL

Convert d-dimer from µg/mL to ng/mL

Sources last checked: 2026-11-03

D-dimer µg/mL → ng/mL

Convert d-dimer from µg/mL to ng/mL

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Converts units only; reference ranges depend on the laboratory, the assay and the patient.

Source: BIPM. The International System of Units (SI), 9th edition, 2019 — Table 8 (non-SI units accepted for use with the SI, incl. litre) and the definition of the kelvin and degree Celsius.Open

What is the D-dimer µg/mL → ng/mL?

D-dimer is reported in µg/mL (identical to mg/L) by some laboratories and in ng/mL (identical to µg/L) by others. This converter multiplies by 1000. Besides the unit, every D-dimer result has a reporting basis — fibrinogen-equivalent units (FEU) or D-dimer units (DDU) — which the conversion leaves unchanged.

When to use it

  • Comparing a result in µg/mL or mg/L with studies or algorithms written in ng/mL
  • Checking an age-adjusted cut-off calculation when the input unit differs from the one in the formula
  • Comparing serial values after a change of laboratory, provided assay and FEU/DDU basis are the same

When not to use it

  • Converting between FEU and DDU — that is a change of reference quantity, not of unit
  • Comparing results from different D-dimer assays, which are not standardised against each other

How it is calculated

D-dimer (ng/mL) = D-dimer (µg/mL) × 1000

Clinical pearls and limitations

  • Converts units only; reference ranges depend on the laboratory, the assay and the patient.
  • ng/mL = µg/mL × 1000; µg/mL = mg/L and ng/mL = µg/L.
  • FEU values are about twice DDU values for the same sample, because fibrinogen is roughly twice the mass of the D-dimer fragment; always read the basis (FEU or DDU) next to the unit.
  • Decision limits for excluding venous thromboembolism are assay-specific and apply only together with a pretest-probability assessment.
  • D-dimer rises with age, pregnancy, cancer, infection, surgery and many other conditions, so a raised value is non-specific.

Frequently asked questions

How do I convert D-dimer from µg/mL to ng/mL?

Multiply by 1000. Example: 1.3 µg/mL = 1300 ng/mL; 0.72 µg/mL = 720 ng/mL.

Is µg/mL the same as mg/L for D-dimer?

Yes. A microgram per millilitre equals a milligram per litre, so the number does not change; the same applies to ng/mL and µg/L.

What is the difference between FEU and DDU?

FEU expresses the result as the mass of fibrinogen from which the measured D-dimer could have arisen; DDU expresses the mass of D-dimer itself. FEU values are therefore about twice as high. Results and cut-offs must use the same basis — this converter does not switch between them.

Evidence and guidelines

  1. Primary source: BIPM. The International System of Units (SI), 9th edition, 2019 — Table 8 (non-SI units accepted for use with the SI, incl. litre) and the definition of the kelvin and degree Celsius.

Have a follow-up question?

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<iframe src="https://medelix.ai/en/embed/d-dimer-ugml-to-ngml" title="D-dimer µg/mL → ng/mL – Medelix" width="100%" height="620" style="border:0;max-width:720px" loading="lazy"></iframe> <p><a href="https://medelix.ai/en/calculators/d-dimer-ug-ml-to-ng-ml">D-dimer µg/mL → ng/mL calculator by Medelix</a></p>

For healthcare professionals and medical students. These tools support, and do not replace, clinical judgement. Always check results against the original source and your local protocols.