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Elevated HBsAB

Just had blood tests done again and my HBsAB, which is not suppose to be more than 9.99, is 428.  It is positive and I know that means i gave the antibodies to fight hep b but why is it so elevated?....
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If your HBsAg is negative, a value of greater 10 IU/L of HBsAb is considered to be protective. The higher value, which is good, may indicate you were recently vaccinated or if you were immunized before, you were recently exposed to HBV and your immunity kicks in to produce high level of HBsAb to counter the potential infection.
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I've asked both my GI doc and family doc in regard to my HBsab, to see how much I have,  all I see on my blood report is qualitative, HB surf antibody reactive, both of them gave me the same answer, even I asked for additional bloodwork to test my hbsab quantitatively, both have declined, saying it is not necessary, in their so call medical system, as long as it is hbsab reactive, the level of hbsab is not significant.  Then I asked another question to see if my body has higher hbsab are better, the doc said not really true.  All I understood was my immune system will able to produce hbsab for life to suppress the HB virus from cccDNA if it ever emerged
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