Inflammation system

C-Reactive Protein (standard)

CRP

A general marker of systemic inflammation produced by the liver.

What is it

C-Reactive Protein (standard) — in plain English.

C-reactive protein is produced by the liver in response to inflammation. The standard CRP assay detects higher levels typical of acute inflammation or infection.

Why it's measured

What CRP can reveal.

CRP has been used clinically and in research as a general marker of inflammation. For cardiovascular risk research, the high-sensitivity (hs-CRP) version is used.

Reference range

Where most laboratories draw the standard line.

Standard laboratory reference

< 10 mg/L

Reference ranges vary by laboratory. Your individual reference range will appear on your test report and should be interpreted by your physician in the context of your overall health profile.

What results may indicate

Higher vs. lower CRP — at a high level.

Elevated

Has been associated with active inflammation, infection, or autoimmune flares in research literature.

Lower

Is generally considered favorable.

These associations are general. They are not a personal diagnosis or prediction. Discuss your individual results with your physician in the context of your full health profile.

When it's measured

When CRP is typically run.

Used in evaluating active inflammation or infection.

Related markers

Often measured alongside CRP.

hs-CRP (high-sensitivity)Heart systemErythrocyte Sedimentation Rate (ESR)Inflammation systemFibrinogenInflammation systemHomocysteineHeart systemFerritin (acute-phase context)Inflammation systemANA ScreenInflammation system

Measured in

CRP is one of 160 biomarkers in the Apex Panel.

A complete look at your heart, hormones, metabolism, inflammation, and longevity systems — drawn at Quest or LabCorp, reviewed by a U.S.-licensed physician.

Explore the Apex Panel →
160 biomarkers13 body systemsPhysician-reviewed
← Back to all biomarkers

This information is for general educational purposes only and is not medical advice. Lab results alone are not intended to diagnose, treat, or cure any condition and do not replace the advice of a healthcare provider. OPTML does not offer medical advice, a diagnosis, medical treatment, or any form of medical opinion.