Data were collected retrospectively and randomly depending on health resources' record system from the areas included in this study. We compare Toxoplasma seropositivity for 2870 women with previous adverse pregnancy outcome(s) with that for 1318 women without such complications. The results showed that there was no significant association between seropositivity and adverse pregnancy outcome(s), p-value= 1.0232. It was concluded that there is no significant difference between seropositivity for Toxoplasma in women with adverse pregnancy outcomes compared to those with otherwise normal pregnancy. Therefore, it is recommended to seek for another reinforcing diagnostic parameter in evaluating such patients. Furthermore, population-based studies of newborns would be helpful to accurately estimate incidence of transplacentally transmitted toxoplasmosis.