Diagnostic Performance of Serum Calprotectin in Acute Appendicitis (SCP-AA)

Acute appendicitis is one of the most common causes of acute abdominal pain requiring emergency surgical intervention. However, establishing an accurate diagnosis may be difficult, particularly in patients presenting with nonspecific abdominal pain or atypical clinical findings. Conventional inflammatory markers and clinical scoring systems are useful adjuncts, but their diagnostic accuracy remains limited.

This prospective single-center observational study evaluated the diagnostic performance of serum calprotectin in adult patients presenting with acute abdominal pain and suspected acute appendicitis. Patients with histopathologically confirmed acute appendicitis were compared with a control group consisting of patients diagnosed with nonspecific abdominal pain after clinical, laboratory, radiological evaluation, and follow-up.

Serum calprotectin concentrations were measured and compared with white blood cell count, C-reactive protein, ferritin, and the Alvarado score. The relationship between serum calprotectin levels and histopathological severity of appendicitis was also assessed.

The primary objective of the study was to determine the diagnostic accuracy of serum calprotectin in distinguishing acute appendicitis from nonspecific abdominal pain.