This result is a typical lab mistake. It should be stated as hbsag is greater than 250 iU/ml.
Uou need to find the lab or maybe pay more to this lab so that they do dilution of the sample. 250 is maximum limit of the analyzer.
As for your visa application this result means that you have hbv and if it is a hurdle for the visa you should probably stop it since unfortunately you can not get rid of it quickly. There is a chance that you are acute so it makes sense to check igm anyway recheck hbsag in 6 month.
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