This serological immunoassay measures IgM antibodies against a range of pathogens that pose a significant risk to the fetus if the mother is infected during pregnancy. This group typically includes: Toxoplasma gondii, other agents (such as rubella virus, syphilis, cytomegalovirus - CMV, and herpes simplex virus), rubella (German measles), cytomegalovirus (CMV), and herpes simplex virus. The presence of IgM indicates an active or recent infection.