Objective: In the present study, we aimed to investigate the correlation of neutrophil to lymphocyte ratio, platelet to lymphocyte ratio, mean platelet volume with the risk of gestational diabetes mellitus. Methods: The study enrolled 120 pregnant women who were the 24th and 28th weeks of gestation, including GDM group (n = 58), the control group (n = 62). The NLR, PLR and MPV levels were measured. Results: NLR, PLR and MPV were significantly higher in GDM compared with control group. Logistic regression analysis showed that elevated WBC, NLR, PLR and MPV was an independent variable for predicting GDM in pregnancy. The OR and 95% CI was (OR: 1.6, 95% CI: 1.2-2.5), (OR: 4.1, 95% CI: 1.3-13.1), (OR: 5.5, 95% CI: 1.5-20.0), (OR: 4.0, 95% CI: 1.2-12.0), respectively. Conclusion: Increased WBC, PLR, NLR, MPV were independent predictors of GDM.