Question 1

What is CRP (C-Reactive Protein)?

Accepted Answer

CRP is an inflammation marker produced by the liver. It rises quickly with infection, injury, or chronic inflammation. High-sensitivity CRP also estimates cardiovascular risk.

Question 2

What are the normal CRP (C-Reactive Protein) levels?

Accepted Answer

Adults: < 5 mg/L. Cardiovascular risk (hs-CRP): < 1 low, 1–3 moderate, > 3 high. (mg/L)

Question 3

What causes low CRP (C-Reactive Protein)?

Accepted Answer

Low CRP is the norm — it means no active inflammation.

Question 4

What causes high CRP (C-Reactive Protein)?

Accepted Answer

Infections, autoimmune flares, obesity, smoking, tissue injury.

Question 5

When should I see a doctor about CRP (C-Reactive Protein)?

Accepted Answer

If persistently elevated without obvious cause — to find the source of inflammation.

CRP (C-Reactive Protein)

Normal ranges

Causes of deviations

Low levels:

High levels:

When to see a doctor