Background: Gestational diabetes is a metabolic disease seen in pregnant women. Neutrophil lymphocyte rate (NLR), platelet lymphocyte rate (PLR) and platelet indices are easily and cheaply available ratios calculated from complete blood count and have been shown to be related to many medical conditions and pathologies.

Aim: Our aim was to evaluate the usability of indexes such as NLR, PLR for the diagnosis of gestational diabetes mellitus.

Methodology: In this retrospective study; pregnant women undergoing OGTT for preliminary diagnosis of gestational diabetes mellitus reviewed for two years. Patients was grouped normal, impaired glucose tolerance and gestational diabetes mellitus. Their hemogram parameters and NLR, PLR ratios was compared between groups.

Result: 112 of 145 patients were included. When complete blood count parameters and indexes calculated from these parameters were compared no difference was found between groups.

Conclusion: This study has found no correlation between complete blood count parameters and indices calculated from these parameters and IGT or GDM. The lack of concordance between results of such studies must lead to further research on this topic.