Risks and limits of CRP Check

The CRP (C-reactive protein) check is a common self-test measuring inflammation. However, CRP is a non-specific marker – elevated levels can result from infections, chronic inflammation, injuries, or even stress. A single reading does not provide a diagnosis. Mild elevations (1–10 mg/L) are particularly difficult to interpret and often not clinically meaningful. Lifestyle factors like smoking, obesity, or poor sleep can also raise CRP. The test cannot replace a medical evaluation. If levels are persistently high, a doctor should investigate underlying causes (e.g., infection, autoimmune disease, cardiovascular risk). Genetic variants in the CRP gene have only small effects on baseline levels. The evidence for the utility of self-tests in risk prediction is moderate. Conclusion: A CRP check can offer a rough indication but not a diagnosis. Marketing often overstates its predictive power.