If you are HBsAB positive, then you can't get HBV from him regardless what level he is; if you are HBsAB negative, the risk is not zero even if he is a healthy carrier.
Thank you for your quick response. One more clarification please. Is it possible to have Hep B and not be contagious to others ( not HBsAB positive ) ? I'm asking because he's saying, he is only a carrier and cannot cause it to others.
The same Hep B patient may be in a period of greater or less infection depending on his lab readings.
People around the patient are very safe if they are HBsAB positive, not whether or not they have been vaccinated.