CRP vs ESR: What Is the Difference?

Q: CRP vs ESR: What Is the Difference?

CRP rises within hours and normalizes quickly. ESR takes days to rise and stays elevated for weeks. Both are non-specific inflammation markers.

CRP and ESR are both inflammation markers but behave differently.

CRP (C-Reactive Protein)

Rises within 6–8 hours of inflammation
Normalizes within 3–7 days after resolution
More sensitive for acute changes
Better for monitoring treatment response

ESR (Erythrocyte Sedimentation Rate)

Rises over days to weeks
Stays elevated for weeks after resolution
Increases with age (normal range changes)
Better for chronic inflammation monitoring

When to Use Which

Acute infection: CRP preferred
Chronic inflammation: ESR + CRP together
Temporal arteritis: ESR classically very high
RA monitoring: both used

Both Are Non-Specific

Neither tells you WHAT is causing inflammation
Only that inflammation exists
Must interpret with clinical picture

Source: NLM MedlinePlus, AACC.

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