A member asked:

My son had blood work and the one test mycoplasma pneumonia igg ab was 2025 normal is 0-99 what could this mean?

5 doctors weighed in across 2 answers

Mycoplasma: Igg indicates he was previously exposed to mycoplasma and he has mounted an immune response to it, how is his igm ? This one indicates an active infection.

Answered 1/6/2015

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Suggests past infctn: Igg is a later phase antibody produced in response to a illness or infection by a specific agent. Igm would be an early phase (first weeks). A higher than expected igg level to this agent suggests the kid had a significant encounter with mycoplasma, an agent well known to cause pneumonia in kids.

Answered 1/3/2014

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