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C-reactive protein (CRP) mg/dL → mg/L

Convert c-reactive protein (crp) from mg/dL to mg/L

Sources last checked: 2026-11-03

C-reactive protein (CRP) mg/dL → mg/L

Convert c-reactive protein (crp) from mg/dL to mg/L

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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 C-reactive protein (CRP) mg/dL → mg/L?

C-reactive protein (CRP) is reported in mg/dL by some laboratories in Germany, Austria, Turkey and the USA, and in mg/L by most European labs and in the majority of international literature. The two units differ by exactly a factor of 10 (1 dL = 0.1 L), and confusing them is one of the most common reporting errors for CRP.

When to use it

  • Reading guidelines, scores or studies that quote CRP in mg/L
  • Comparing a mg/dL result with an earlier result from a lab that reports mg/L
  • Handing over a patient between hospitals that use different units

When not to use it

  • Procalcitonin or other inflammatory markers — they have their own units
  • Comparing a CRP result with an hs-CRP result as if the method range were the same — the unit is identical, but the assays are optimised for different ranges

How it is calculated

CRP (mg/L) = CRP (mg/dL) × 10

Clinical pearls and limitations

  • Converts units only; reference ranges depend on the laboratory, the assay and the patient.
  • mg/L = mg/dL × 10.
  • A CRP that 'jumped tenfold' between two labs is more often a unit change than a clinical change — check the report header.
  • hs-CRP is reported in mg/L as well; it is the same analyte measured with an assay optimised for low concentrations.
  • Thresholds in guidelines and scores are unit-specific and context-specific; they depend on the guideline and the laboratory.

Frequently asked questions

How do I convert CRP from mg/dL to mg/L?

Multiply by 10. Example: 0.5 mg/dL = 5 mg/L; 12 mg/dL = 120 mg/L.

Is CRP in mg/dL or mg/L?

Both are used. Many European laboratories report mg/L, some German, Austrian and Turkish laboratories mg/dL. The unit on the report decides.

Is hs-CRP a different unit?

No. hs-CRP is given in mg/L too; 'high-sensitivity' describes the assay, not the unit.

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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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.