Table 3. Predictive value of undetectable HCV RNA and HCV Ag at week 4 of the treatment on sustained virologic response.

Assay target	PPV*	NPV†
Undetectable HCV RNA	9/9 (100%)	4/6 (66.7%)
Undetectable HCV Ag	12/13 (92.3%)	1/2 (50.0%)

HCV, hepatitis C virus; HCV Ag, HCV core antigen.

^*Positive predictive values (PPVs) correspond to the rate of patients with undetectable HCV Ag or HCV RNA levels and subsequent sustained virologic response; ^†Negative predictive values (NPVs) correspond to the rate of patients without undetectable HCV Ag or HCV RNA levels and subsequent sustained virologic response.