Toxoplasma gondii Antibodies, IgG

Casandra

Casandra Test Code LC33552Version 1 (DRAFT)

Performing Lab

Lab LabcorpLab Test ID 006478CPT Code 86777

Toxoplasma gondii Antibodies, IgG

Also known as: Toxoplasmosis

Clinical Use

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Use

Qualitative determination of IgG antibodies to Toxoplasma gondii (T. gondii) to aid in the determination of immune status of individuals including pregnant women. If IgG antibody is detected, it is recommended that IgM testing be performed if more precise knowledge of the time of infection is needed (e.g., pregnant women). A positive IgM but a negative IgG result should be viewed with suspicion; the patient should be retested two weeks after the first test. If the patient is pregnant and IgG/IgM positive, an IgG avidity test should be performed.

Special Instructions

A positive IgM result alongside a negative IgG result should be approached with caution, suggesting potential false-positivity for IgM. In cases of positive IgM and negative IgG, retesting after two weeks is advised. For pregnant patients with positive results, IgG avidity tests might be necessary for more accurate assessment.

Limitations

This test has not been cleared or approved by the FDA for screening blood or plasma donors. Interpretation of results should consider possible cross-reactivity and the clinical context in which results are obtained. False-positive results can occur, especially in the presence of rheumatoid factor or other interfering substances.

Test Details