Toxoplasmosis in the foetus can be best confirmed by-
IgM can be detected within the first 2 weeks of infection using the ISAGA or ELISA methods. .Women who are positive for IgG and negative for IgM are defined as immune and no fuher follow-up is necessary, because their fetuses are not at risk of congenital toxoplasmosis Ref Harrison20th edition pg 1312
IgM antibodies against Toxoplasma in the mother
IgM antibodies against Toxoplasma in the foetus
IgG antibodies against Toxoplasma in the moter
IgG antibodies against Toxoplasma in the foetus
Infection