Gestational diabetes is a carbohydrate intolerance of variable severity with onset or first recognition during pregnancy. It occurs in all ages but more pronounced among the aging pregnant women. Haematological parameters have been reported as good markers to monitor the gestational diabetes patients. Careful haematological investigations will help to improve the wellbeing of the affected patients and prevent it as predictors of the severity of the disease. This paper was written to enhance the knowledge of the society on this incident that happens to a lot of pregnant women if not monitored may precipitate so many damages in the systems and organs of the pregnant women.