C-Reactive Protein (CRP)
Here’s what it reflects — and what to do about it.
Longetic pulls together every lab and record you’ve had, follows how C-Reactive Protein (CRP) changes over time, and explains what’s shifting — so you walk into your next appointment prepared, with reminders for retests along the way.
What is C-Reactive Protein (CRP)?
A protein made by the liver that rises in response to inflammation in the body.
CRP is made by the liver and rises within hours of infection, injury, or ongoing inflammation, then falls again once the trigger resolves — it's a general marker of inflammation, not specific to any one condition. A more sensitive version, hs-CRP (high-sensitivity CRP), can detect much lower concentrations and is used specifically to gauge cardiovascular risk in people who otherwise appear healthy.
What to know about C-Reactive Protein (CRP)
Understanding C-Reactive Protein (CRP) means knowing what it reflects, what tends to move it, and the signs that suggest it’s worth a closer look — so you can bring the right questions to your next appointment.
How to read a value in context
CRP reflects general inflammation in the body, and its reference categories are risk bands from population studies, not a pass/fail health check. A 'low risk' result lowers the statistical odds of certain cardiovascular and inflammatory issues, but it doesn't guarantee zero risk, and CRP can rise temporarily from minor things like a cold or recent exercise.
Lifestyle factors that influence this marker
- Choose anti-inflammatory foods like vegetables, fish
- Move your body regularly throughout the week
- Prioritize consistent, sufficient sleep
- Talk to your doctor before making changes based on this result.
Tests often checked alongside this
- ESR — tracks inflammation over a longer time window
- Lipid panel — adds context for cardiovascular risk
- Homocysteine — another independent marker of cardiovascular risk
How this can show up in how you look and feel
- CRP itself typically produces no noticeable symptoms or visible signs
- Elevated CRP is usually silent, which is exactly why it's tested rather than felt
- Any symptoms usually come from whatever underlying condition is driving the inflammation, not from CRP directly
What can affect this marker
- Recent infection or illness
- Intense or prolonged exercise
- Smoking and body weight
- Chronic inflammatory conditions
What to track over time
- Your trend across repeat tests
- Whether levels return to baseline
- Alongside other inflammation markers
- Symptoms during flare-ups
What to ask your doctor
- What might be driving this result?
- Should I retest once I'm well?
- Is this the high-sensitivity version?
- Does this affect my heart risk?
This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Medical Disclaimer.
References
About our sources
Official sources
Government health agencies, national institutes, and intergovernmental bodies whose guidelines carry regulatory or policy weight.
Clinical / professional
Medical societies, specialty colleges, and professional associations whose consensus statements reflect clinical practice standards.
Peer-reviewed research
Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.