Elevated C-Reactive Protein Levels and Systemic Inflammation

Introduction to C-Reactive Protein

• Normal CRP concentrations are typically below 3 mg/L, but can rise above 500 mg/L during acute illness 1

Clinical Significance of Elevated CRP Levels

• Acute infection typically shows higher CRP elevations (median ~120 mg/L) compared to non-bacterial infections (median ~32 mg/L) 1
• Inflammatory diseases can elevate CRP (median ~65 mg/L) 1
• CRP is an independent predictor of cardiovascular events, though levels are typically lower (median ~6 mg/L) in stable cardiovascular disease 2, 3
• Solid tumors can cause CRP elevation (median ~46 mg/L) 1

Interpretation and Clinical Implications

• The American Heart Association suggests that CRP levels are independent predictors of cardiovascular events in both primary prevention populations and post-MI patients 2, 5
• Elevated CRP correlates with traditional cardiovascular risk factors including adiposity, smoking, and insulin resistance 5
• CRP values >10 mg/L can be associated with smoking behavior 1, obesity 1, 5, heritable factors 4, and demographic factors (age, sex, race) 4

Next Steps in Management

• Consider additional testing based on clinical suspicion (imaging, cultures, etc.) 4
• Initiate appropriate treatment for the identified underlying condition 3