The diagnosis of toxoplasmosis infection is generally established through laboratory tests, though in some cases, radiological examinations may also be included in the diagnostic process.

Laboratory Tests:
* Blood Test: The presence of IgM and IgG antibodies formed against Toxoplasma gondii in the blood is examined. These antibodies provide important information about whether the infection is acute or from a past period.
* Amniocentesis: In cases where there is a risk of infection during pregnancy, samples taken from the amniotic fluid are analyzed for the Toxoplasma parasite or antibodies to determine if the baby is infected.
* Biopsy: In individuals with weakened immune systems, infection-related lesions may form in organs. Biopsy samples taken from these lesions are examined to confirm the presence of the parasite.
* Stool Sample Analysis: This method, rarely used, involves searching for the parasite itself or its eggs in stool. However, it is not sufficient for standalone diagnosis and is usually evaluated in conjunction with other tests.

Radiological Examinations:
* Imaging (MRI, CT): Especially in cases of suspected infection in the central nervous system (such as the brain), imaging methods like magnetic resonance imaging (MRI) or computed tomography (CT) are used to obtain detailed anatomical information, and infection-related lesions are evaluated.