Erythrocyte sedimentation rate and C-reactive protein

Area of Science:

• Biochemistry
• Clinical Chemistry
• Immunology

Background:

• The erythrocyte sedimentation rate (ESR) is a common but less reliable indicator of inflammation.
• Factors like renal disease, female sex, and older age can affect ESR results, leading to inaccuracies.
• C-reactive protein (CRP) is an alternative biomarker for inflammation.

Purpose of the Study:

• To compare the efficacy of C-reactive protein (CRP) versus erythrocyte sedimentation rate (ESR) as indicators of inflammation.
• To highlight the limitations and potential inaccuracies associated with ESR measurements.

Main Methods:

• Comparative analysis of CRP and ESR in clinical settings.
• Evaluation of sensitivity and responsiveness to clinical changes.
• Assessment of the frequency of false negative and false positive results for both markers.

Main Results:

• C-reactive protein (CRP) demonstrates higher sensitivity and quicker response to clinical changes than ESR.
• ESR measurements are more prone to false negative and false positive results.
• Specific conditions like renal disease, female sex, and older age can elevate ESR levels independently of active inflammation.

Conclusions:

• CRP is a more accurate and reliable biomarker for inflammation compared to ESR.
• ESR has limited utility and is susceptible to confounding factors, though it may aid in specific cases like low-grade bone infections or monitoring systemic lupus erythematosus.