The aim of this study was the determination of IgM antibodies IgG anti toxoplasma gondii in pregnant women, attended in a private health place, being the main reservoir of this infection the domestic cat (Felis catus), can occur at any stage of pregnancy, it is important to detect the first trimester of pregnancy to prevent disorders of the central nervous system and retinochoroiditis. The clinical method used was electroquimiolumisencia high sensitivity for the diagnosis of IgG - IgM antibodies, the results of IgG antibodies against T. gondii in pregnant women was 16% IgG anti-IgM seropositive for T. gondii, in relation of pregnant women with positive serology for T. gondii decreased linearly with the age of the patient, being the group most affected 20-25años 40 (12%) for IgG and IgM positive 25 (10%) giving reference on prevalence of Toxoplasma gondii.