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[TEST] IFA IgG test Example: Titer 1:640 [Comments] If the patient has an immune deficiency with low total IgG, then the antibody titer will not be elevated. If HHV-6 is the only antibody titer out of five viruses to be elevated above average, then this indicates possible HHV-6 infection.
If the titer is highly elevated relative to healthy controls, it means that the patient may have had a recent infection or has a current chronic infection. Titers vary by laboratory. Focus Diagnostics (Quest) has a median antibody titer between 1:80 and 1:160 for controls. Other labs have much lower control titers.
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Can it differentiate active from latent infection?