The Toxoplasma gondii test is used to detect an active infection in pregnant women, unborn babies, or individuals with a weakened immune system (immunocompromised), especially when flu-like symptoms are present. It can also help determine if a person has had a previous Toxoplasma infection or assist in identifying whether complications are due to an active infection. This test is crucial for managing risks associated with Toxoplasmosis, particularly in pregnancy and in people with compromised immune systems.