Table 1. HBV DNA Monitoring During Antiviral Therapy.

Treatment duration, y	HBV DNA	Interpretation
1	≥ 10 IU/mL or ≥ 50 copies/mL reduction from baseline	Virologic response
1	< 10 IU/mL or < 50 copies/mL reduction from baseline	Primary treatment failure
2	Undetectable by PCR	Complete virologic response
2	≥ 60 to < 2000 IU/mL (or ≥ 300 to < 10,000 copies/mL)	Partial virologic response
2	> 2000 IU/mL (or > 10,000 copies/mL)	Inadequate virologic response