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The aim of this study is to evaluate and compare the diagnostic ability of platelet-related parameters and white cell-based parameters in pregnant women with appendicitis. This is a retrospective case-controlled study. Women aged between 18 and 50-years-old who had undergone appendectomy between January 2010 and January 2021 were enrolled in the study. Age, pathological diagnosis and relevant laboratory parameters were recorded for each patient. Gestational characteristics were recorded for pregnant patients. There were 58 pregnant and 1171 non-pregnant women enrolled. Pregnant women with acute appendicitis were significantly younger ( p  &lt; .0001,  d = −0.532), had significantly lower PLT ( p  = .002,  d = −0.428) and ALC ( p  = .033,  d = −.304) levels but had significantly higher MPV ( p  = .004,  d  = .415) levels than non-pregnant counterparts. In pregnant women, only MPV was the independent predictor of acute appendicitis (OR: 1,952). MPV cut-off value of 9,6 fL provided 63,5% sensitivity, 67,7% specificity, 94,2% PPV and 17,3% NPV whereas 10 fL provided 55,8% sensitivity, 100% specificity, 100% PPV and 21,4% NPV for acute appendicitis in pregnant women. Therefore, MPV might be useful for diagnosing acute appendicitis in pregnant women.Impact statementWhat is already known on this subject?  In pregnant women, counts and percentages of white blood cells and neutrophils are known to be independent predictors of acute appendicitis. Meanwhile, physiologic leukocytosis of gestation is a challenge for interpretation of these parameters. Platelets and related markers are, as well, predictive for inflammatory processes in the human body.What do the results of this study add?  The role of platelet-related markers in the diagnosis of acute appendicitis in pregnant women has not been studied previously. The results of the present study indicate that in pregnant women, changes in mean platelet volume might be an independent predictor of acute appendicitis.What are the implications of these findings for clinical practice and/or further research?  Further similar large-scale case-controlled or cohort studies are required to validate the present results. In pregnant women with abdominal pain, the use of mean platelet volume as a biomarker could reduce negative laparotomy rates. A mean platelet volume is a useful tool for diagnosing acute appendicitis in pregnant women and provides helpful guidance for clinicians dealing with these patients in the emergency room. What is already known on this subject?  In pregnant women, counts and percentages of white blood cells and neutrophils are known to be independent predictors of acute appendicitis. Meanwhile, physiologic leukocytosis of gestation is a challenge for interpretation of these parameters. Platelets and related markers are, as well, predictive for inflammatory processes in the human body. What do the results of this study add?  The role of platelet-related markers in the diagnosis of acute appendicitis in pregnant women has not been studied previously. The results of the present study indicate that in pregnant women, changes in mean platelet volume might be an independent predictor of acute appendicitis. What are the implications of these findings for clinical practice and/or further research?  Further similar large-scale case-controlled or cohort studies are required to validate the present results. In pregnant women with abdominal pain, the use of mean platelet volume as a biomarker could reduce negative laparotomy rates. A mean platelet volume is a useful tool for diagnosing acute appendicitis in pregnant women and provides helpful guidance for clinicians dealing with these patients in the emergency room.

Case controlled study on diagnostic predictive value of inflammatory markers of complete blood count in pregnant women with acute appendicitis