What are the routine blood test findings in appendicitis?

Appendicitis typically develops rapidly, inevitably causing anxiety in patients who often lack a clear understanding of the entire treatment process. So, what are the typical findings on a complete blood count (CBC) in appendicitis?

What CBC Findings Are Associated with Appendicitis?

When the appendix becomes inflamed—most commonly due to bacterial infection—the CBC (often referred to as a “blood profile”) typically reveals leukocytosis, particularly an increase in neutrophils. The normal white blood cell (WBC) count ranges from 4 × 10⁹/L to 10 × 10⁹/L. In appendicitis patients, this value may rise significantly—to 15 × 10⁹/L, 20 × 10⁹/L, or even 25 × 10⁹/L. Neutrophil percentage often increases to 70–80%, while lymphocyte percentage correspondingly decreases. These changes represent the classic CBC pattern observed in uncomplicated appendicitis.

However, some patients exhibit atypical CBC results. For instance, WBC elevation may be minimal or absent—remaining within the normal reference range—and neutrophil percentage may not increase significantly. Rarely, appendicitis can result from viral or parasitic infections. In such cases, the CBC may show a normal total WBC count, with relative increases in lymphocytes or eosinophils.

Patients are advised to follow a semi-liquid diet with small, frequent meals to facilitate smooth recovery. We hope this information is helpful. Wishing you good health and happiness!