Introduction: Acute appendicitis is the most frequently encountered non-obstetric disease requiring surgical intervention during pregnancy. Early diagnosis reduces maternal and foetal morbidity/mortality rates. Aim: This study aims to investigate haemogram parameters in the diagnosis of acute appendicitis in pregnant women. Materials and methods: A retrospective case-controlled study was conducted in three groups. Thirty-nine pregnant patients with acute appendicitis (Group A), 39 fertile, non-pregnant patients with acute appendicitis (Group B) and 39 healthy pregnant women (Group C) were included in the study. The WBC, neutrophil and lymphocyte counts and NLR, PLR, MPV and RDW values were compared. Results: The mean NLR values in Groups A, B and C were 7.39 (1.58–46.6), 5.66 (1–20) and 4.23 (1.54–10.77), respectively, and there was a significant difference in NLR values between the groups (P = 0.002). The mean PLR values in Groups A, B and C were 159.09 (69.1–574), 134.28 (21.5–360) and 120 (68.7–334), respectively, and the difference was statistically significant (P = 0.019). The cutoff value for WBC count was 14 155 106/μL (51.3% sensitivity; 82.1% specificity), for neutrophil count it was 10 955 106/μL (53.8% sensitivity; 84.6% specificity), for NLR it was 9.23 (46.2% sensitivity; 92.3% specificity) and for PLR it was 157.6 (51.3% sensitivity; 82.1% specificity). NLR had the largest area under the curve, with 0.667 NLR. Conclusion: Neutrophil and WBC counts and PLR were found to be the most valuable inflammatory parameters. However, RDW, lymphocyte count and MPV levels were not found to be valuable markers in terms of sensitivity and specificity in the diagnosis of acute appendicitis in pregnant patients
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