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Unlike antibody tests, HCV RNA tests directly measure for the presence of the hepatitis C virus. HCV RNA tests may be qualitative or quantitative. Qualitative HCV RNA tests are used to diagnose hepatitis C. Your doctor might choose to perform an HCV RNA test instead of the ELISA, especially if you are at high-risk for hepatitis C. The HCV RNA test will be positive in as little as 1 to 2 weeks after exposure. A positive HCV RNA test means a person has hepatitis C infection.
Quantitative HCV RNA tests allow your doctor to determine exactly how much virus is in the blood. This is referred to as the viral load. The viral load is usually expressed as units per milliliter or copies per milliliter. In patients with chronic hepatitis C infection, viral loads vary widely from 50,000 to 5 million copies per milliliter. A higher viral load may not necessarily be a sign of more severe or more advanced disease but it does correlate with likelihood to respond to treatment. HCV RNA tests can also be used to monitor response to hepatitis C treatment. For example, if the viral load decreases during treatment, this suggests that treatment is working and should be continued. Conversely, if the viral load remains the same, it suggests that the patient is not responding to treatment.
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