title: Mean Platelet Volume is Reduced in Acute Appendicitis.
abstract: OBJECTIVE
  Acute appendicitis (AA) is the most common indication for emergency abdominal surgery, although it remains difficult to diagnose. In this study, we investigated the the clinical utility of mean platelet volume in the diagnosis of acute appendicitis.
  
  
  METHODS
  The medical records of 241 patients who had undergone appendectomy between June 2013 and March 2014 were investigated retrospectively. Sixty patients who had undergone at least one complete blood count during preoperative hospital admission and who had no other active inflammatory conditions at the time the sample was taken were included in the study. Mean platelet volume and leukocyte count values were determined in each patient at hospital admission and during active acute appendicitis. Age, sex, mean platelet volume and leukocyte counts were recorded for each patient.
  
  
  RESULTS
  The mean age of patients was 33.15±10.94 years and the male to female ratio was 1.5:1. The mean leukocyte count prior to acute appendicitis was 7.42±2.12×10(3)/mm(3). Mean leukocyte count was significantly higher (13.14±2.99×10(3)/mm(3)) in acute appendicitis. The optimal leukocyte count cutoff point for the diagnosis of acute appendicitis was 10.10×10(3)/mm(3), with sensitivity of 94% and a specificity of 75%. The mean platelet volume prior to acute appendicitis was 7.58±1.11 fL. Mean platelet volume was significantly lower (7.03±0.8 fL) in acute appendicitis. The optimal mean platelet volume cutoff point for the diagnosis of AA was 6.10 fL, with a sensitivity of 83% and a specificity of 42%. Area under the curve for leukocyte count diagnosis was 0.67 and 0.69 for the diagnosis of AA by mean platelet volume.
  
  
  CONCLUSIONS
  Mean platelet volume was significantly decreased in acute appendicitis. Mean platelet volume can be used as a supportive diagnostic parameter in the diagnosis of acute appendicitis.
authors.affiliation: Department of Emergency Medicine, Sakarya University Training and Research Hospital, Sakarya, Turkey.
authors.forename: Egemen
authors.initials: E
authors.lastname: Kucuk
authors.affiliation: Department of Gastroenterology, Diyarbakir Military Hospital, Diyarbakir, Turkey.
authors.forename: Irfan
authors.initials: I
authors.lastname: Kucuk
keywords: Acute appendicitis; diagnosis; mean platelet volume