I think in the US we don't have HBsAg quant, but only positive or negative. My doctor order a ultrasound plus blood work of tsh,cmp, ggt, CBC,pt,ptt,icd, hbv DNA quant, AFP everytime I see him.
what about HBsAg level in march 12 and jan13?
Your hbvdna number still looks very good after 1 year. So keep monitoring.