Efficacy of bilirubin values in diagnosing acute appendicitis in patients with normal white blood cell count and predicting complicated appendicitis.

Background: Laboratory parameters have important diagnostic value in the evaluation of acute appendicitis. This study aimed to evaluate the efficacy of bilirubin values in predicting acute and complicated appendicitis in patients with leukocyte values in the normal reference range.

Methods: This study included 200 patients aged 18 and over who underwent appendectomy with leukocyte values within the normal reference range. The demographic characteristics, total and direct bilirubin and C-reactive protein values of the patients were examined. According to the pathology results, the patients were divided into two groups as a normal appendix and acute appendicitis. Acute appendicitis was further classified as simple and complicated.

Results: Of the 200 patients included in this study, 110 (55%) were female and 90 (45%) were male, and the mean age was 37±16 years. The pathology results were reported as normal in 45 (22.5%) and acute appendicitis in the remainder of the sample. Of those diagnosed with acute appendicitis, 141 (91%) had simple appendicitis and 14 (9%) had complicated appendicitis. When the normal appendix and acute appendicitis groups were compared, the total and direct bilirubin levels were higher in the patients diagnosed with acute appendicitis. According to the receiver operator characteristic curve analysis, the area under the curve values of total bilirubin and direct bilirubin for the prediction of acute appendicitis were 0.597 and 0.625, respectively.

Conclusion: In patients with normal leukocyte values, high bilirubin levels may be useful in predicting the diagnosis of acute appendicitis.