CRP Test Explained: Inflammation in Context

Understand what C-reactive protein indicates, why CRP is nonspecific, how acute illness and chronic conditions affect it, and why trends need clinical context.

CRP is a nonspecific marker of inflammation. It can show that inflammation is present or changing, but it cannot identify the cause by itself.

CRP can rise with infection, injury, inflammatory disease, and other conditions.

A high result does not identify which tissue or disease process is responsible.

Symptoms, examination, other tests, and the trend over time determine its meaning.

What CRP can tell you

The liver produces CRP in response to inflammatory signaling. Levels may rise quickly and fall as inflammation resolves.

What CRP cannot tell you

CRP does not distinguish infection from autoimmune disease, injury, or another cause. Different CRP tests may also be used for different clinical questions.

Questions for follow-up

Was the test taken during illness, injury, or another temporary inflammatory event?

Are there symptoms or other results that suggest a specific source?

Is repeat testing needed after recovery?

Was standard CRP or high-sensitivity CRP ordered, and for what purpose?