Use As Diagnostic
The measurement of immunoglobulin G can be a diagnostic tool for certain conditions if indicated by certain symptoms. Clinically, measured IgG antibody levels are generally considered to be indicative of an individual's immune status to particular pathogens. A common example of this practice are titers drawn to demonstrate serologic immunity to measles, mumps, and rubella (MMR), hepatitis B virus, and varicella (chickenpox), among others.
Testing of IgG is not indicated for diagnosis of allergy.
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