How often should the immunity level be checked?

It is for my son, 10 years old. He has been fully vaccinated. I have chronic hepb, on antiviral treatment.
Five years ago, I got his immunity level checked, as show in the image

My doctor said it is pretty high and doesn’t need to check again. Can I double check on it? Thanks!

Dear @abcde ,

Anti-HBs levels > 100 mIU/mL are considered a strong antibody response.


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