Serum C-reactive protein as an adjunct for identifying complicated parapneumonic effusions

Area of Science:

• Pulmonology
• Biochemistry
• Medical Diagnostics

Background:

• Differentiating complicated parapneumonic pleural effusions (CPPE) from uncomplicated (UPPE) is clinically challenging.
• Accurate diagnosis is crucial for appropriate patient management and treatment decisions.

Purpose of the Study:

• To evaluate the utility of serum C-reactive protein (sCRP) in distinguishing CPPE from UPPE.
• To assess if sCRP, alone or with pleural fluid parameters, improves diagnostic accuracy.

Main Methods:

• A study involving 104 patients (47 UPPE, 57 CPPE) was conducted.
• Serum C-reactive protein (sCRP) and standard pleural fluid biochemical data were analyzed.

Main Results:

• sCRP levels were significantly higher in CPPE (238 mg/L) than UPPE (147 mg/L).
• An sCRP cutoff of 200 mg/L showed 81% specificity for CPPE.
• Combining sCRP with pleural fluid glucose achieved 98% specificity for CPPE when used with an 'and' rule.

Conclusions:

• Serum C-reactive protein (sCRP) is a valuable biomarker for differentiating CPPE from UPPE.
• Combining sCRP with pleural fluid biochemistries enhances diagnostic accuracy for CPPE requiring chest drainage.