C-Reactive Protein (CRP)

Normal range < 1.0 (varies) mg/dL (< 10 mg/L SI). Specimen: Serum.

Also known as: C reactive protein.

< 1.0 (varies) mg/dLReference range

Reference range

This result is reported qualitatively or as a one-sided threshold rather than a two-sided numeric band.

Specimen	Serum
Conventional range	< 1.0 (varies) mg/dL
SI range	< 10 mg/L
Conversion factor	×10 (conventional → SI)
Panel	Inflammatory & Other Chemistry

Convert any C-Reactive Protein (CRP) result between units on the unit converter.

What is the normal range for C-Reactive Protein (CRP)?

The standard teaching reference range for C-Reactive Protein (CRP) is < 1.0 (varies) mg/dL in conventional units, or < 10 mg/L in SI units. This value is measured in serum.

Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population — always use the range printed on the actual result.

Above the range

Common causes of a high C-Reactive Protein (CRP)

Acute infection or inflammation
Tissue injury or surgery
Autoimmune flare
Malignancy

At the bedside

Nursing considerations

A sensitive but non-specific acute-phase reactant; rises and falls faster than the ESR.
High-sensitivity CRP (hs-CRP) is used for cardiovascular risk stratification.

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