Treatment for hepatitis C is aimed at reducing the viral load, and making it negative (undetectable). ‘Undetectable’ means that no virus is currently present in your blood. Your doctor will check your viral load at different times during the treatment, depending on the type of hepatitis C virus infecting you.
At the end of treatment, after the virus becomes undetectable, the viral load is measured after 3 to 6 months to assess if the response is maintained. If your treatment is successful, it means no virus is present in the blood 3 to 6 months after the medications have been stopped. If the medicine and your immune system were able to clear the virus for a time but could not do so completely, then after you stop taking the medicine, the infection may come back. Your doctor may also perform frequent lab tests such as liver enzymes, blood cell counts, viral load, etc., while you are being treated.