3 doctors weighed in:

How long after having mono will it show up in a blood test? And how long must you have it before it will show up

3 doctors weighed in
2 doctors agree

In brief: It depends

It depends on the blood test, mono spot is helpful but not as sensitive as IgG and IgM titters.
Igg will show if you have ever had it and IgM will show a recent or current infection.

In brief: It depends

It depends on the blood test, mono spot is helpful but not as sensitive as IgG and IgM titters.
Igg will show if you have ever had it and IgM will show a recent or current infection.
Dr. Marina Armendariz
Dr. Marina Armendariz
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