Test Details: Hepatitis C is a liver infection caused by the hepatitis C virus (HCV). The HCV RNA test is used: 1. To confirm a positive HCV Ab result and make the diagnosis of current HCV infection. 2. To measure a patient's baseline viral load prior to starting HCV therapy. 3. To monitor a patient's response to therapy. 4. To determine whether a patient has achieved a sustained virologic response (SVR).