What does a high CRP mean?
A raised CRP tells your doctor that inflammation is present, and roughly how much, but not where it is coming from. Bacterial infections often cause high levels; mild rises can come from many causes including viral illness, injury and chronic conditions.
Because it is non-specific, CRP is interpreted alongside your symptoms, examination and other tests — it is a clue, not a diagnosis.
Why is it sometimes repeated?
CRP changes quickly, so the trend over time is useful: a falling level can suggest an infection is improving or responding to treatment, while a rising level may prompt a closer look.
A separate, very sensitive version (hs-CRP) is sometimes used to help assess cardiovascular risk, which is a different purpose from checking for infection.
Common questions
Does a normal CRP rule out infection?
Not always — CRP can be normal early in an illness or with some infections. Doctors interpret it together with your symptoms and other findings.
Related tools
These calculators are designed for healthcare professionals.