Toxoplasma gondii (IgA) Antibody, ELISA Test
This test measures the level of IgA antibodies against Toxoplasma gondii in a blood sample, using an ELISA method. Quest describes it as a tool that can support early evaluation of acute toxoplasmosis in pregnant women and in individuals with AIDS.
About this test
The test measures IgA antibodies directed against Toxoplasma gondii, the parasite that causes toxoplasmosis, in a serum sample analyzed by enzyme-linked immunosorbent assay (ELISA). IgA antibodies are a different class from the IgG antibodies measured by other Toxoplasma tests, and Quest describes IgA testing as useful for early evaluation of acute disease in pregnant women and in people with AIDS, as well as for congenital infection, since IgA antibodies do not cross the placenta.
People who talk with their clinician about this test are often being evaluated in a context where the timing of a Toxoplasma gondii exposure matters, such as during pregnancy or when congenital infection is being considered, because IgA antibody status is read differently from IgG in those situations.
Test details
| Collection | Quest patient service center |
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Quest resources
Additional details
What this test looks at
The test reports one value: the level of IgA antibody against Toxoplasma gondii, measured by ELISA. It is a separate product from the IgG antibody test for the same parasite; a clinician chooses which antibody class to test based on the clinical question being asked.
This test isn't part of the Celio Health store at the moment, so it can't be ordered or requested here. The test menu lists everything that can.
Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.
Frequently asked questions
What does this test measure?
It measures the level of IgA antibodies against Toxoplasma gondii in a serum sample, using an enzyme-linked immunosorbent assay (ELISA).
How is the sample collected?
The test uses a serum sample from a routine blood draw.
Do I need to prepare for this test?
No preparation instructions are listed for this test, though people follow any instructions their ordering clinician provides.
Why is IgA tested instead of IgG?
IgA antibodies do not cross the placenta, so Quest describes IgA testing as useful for evaluating congenital infection and for early evaluation of acute toxoplasmosis in pregnant women and in individuals with AIDS.
Is this the same as the Toxoplasma IgG antibody test?
No. This test measures IgA antibodies specifically. The IgG antibody test is a separate product that reflects a different, often longer-lasting, part of the antibody response.