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Blood Test Tracker

Hepatitis C Virus RNA (Quantitative)

Measures how much hepatitis C virus genetic material (RNA) is in your blood. It shows whether the virus is present now and how treatment is going.

AI-verified against cited sources. Awaiting expert reviewAlso called HCV RNA, HCV VLLOINC 11011-4

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What it is

Hepatitis C is a virus that infects the liver. This test finds the virus's genetic material (RNA) in your blood and measures how much there is, using a method called PCR. The result is usually reported in international units per milliliter (IU/mL), and many labs also print a log number. A hepatitis C antibody test shows whether you have been exposed. The RNA test shows whether the virus is in your blood now.

Why it matters

Many labs run this test automatically when a hepatitis C antibody test is reactive, because CDC recommends it as the next step. A detected result is a sign of a current infection, and your clinician can talk with you about treatment. The test is also used before and after treatment. A result that is undetectable or too low to measure 12 or more weeks after treatment ends is how cure (called SVR12) is defined. The amount of virus does not show how much liver damage there is.

If it’s high

Detected HCV RNA means the virus is in your blood now, which points to a current hepatitis C infection. The number tells how much virus there is, but not how much your liver has been affected. Hepatitis C can be cured with antiviral medicines, and your clinician can talk with you about next steps.

Common causes

  • A current long-term (chronic) hepatitis C infection
  • A recent (acute) infection, which RNA can show 1 to 2 weeks after exposure, before antibodies appear
  • Infection that has returned after treatment (relapse)
  • A new infection after an earlier cure or clearance (reinfection)

What can help

  • Ask your clinician about treatment options and whether other tests, such as a liver fibrosis check, would help
  • Ask whether you should also be tested for hepatitis B and HIV, which can spread in similar ways

What can affect your result

  • Time since exposure: RNA can show up 1 to 2 weeks after exposure, earlier than antibodies
  • Treatment: the level falls during effective treatment
  • Test brand: the lowest level each test can measure differs
  • Lab handling: serum should be separated and frozen soon after the draw (Mayo asks within 2 hours)
  • A cleared infection: RNA becomes not detected, but antibodies usually remain
  • Sample handling matters: Mayo Clinic Laboratories asks for serum to be separated within 2 hours of the draw and shipped frozen.
  • Each test brand has its own lowest measurable level, so 'not detected' and 'detected, below the quantifiable level' are different results. Use the same lab and test over time when you can.
  • Very recent infection can show up on RNA testing about 1 to 2 weeks after exposure, well before antibodies appear.

The result shows the virus at the time of the draw. After treatment, cure is judged by a test done 12 or more weeks after the last dose (called SVR12).

When to talk to a clinician

Talk with your clinician soon about any detected result. If you may have been exposed in the last 6 months and your antibody test was non-reactive, ask about RNA testing. Get medical care promptly for yellow skin or eyes, a swollen belly, vomiting blood, black stools or confusion.

Questions you could ask

  • Was this result measured with the same test as my last one?
  • What treatment options might fit my situation?
  • Do I need a liver fibrosis check or other tests first?
  • Should I be checked for hepatitis B and HIV too?
  • Does this result mean the infection has cleared, or do I need another test?
  • If I finished treatment, when should my follow-up test be?

Questions people ask

My antibody test was reactive but my RNA was not detected. Do I have hepatitis C?

A not-detected RNA result means no virus was found in your blood. AASLD-IDSA says people with this pattern have no laboratory evidence of current infection, which can mean the infection cleared on its own or with treatment. The antibody result can also be a false positive. You can be infected again, so ask your clinician about your own risk and whether to retest.

What is the difference between 'not detected' and 'detected, below the limit'?

'Not detected' means the test found no virus. 'Detected' with a note such as 'below the limit of quantification' means a tiny amount of virus was seen, but it is too little to put a number on. Your clinician can tell you what your result means and whether to repeat the test.

Does a higher number mean worse liver damage?

No. The amount of virus and the amount of liver damage are separate things. Other tests, such as liver enzymes, platelet count, fibrosis scores or imaging, help show liver health.

Show the science and sources

For clinicians and researchers

HCV RNA is measured by real-time reverse-transcription PCR and reported in IU/mL. Mayo Clinic Laboratories lists 'Undetected' as the reference value for its serum assay (test HCVQN), used before, during and after therapy and to detect acute infection before antibodies appear (under about 2 months from exposure). CDC says RNA can be detected as early as 1 to 2 weeks after exposure and recommends automatic (reflex) RNA testing after a reactive antibody result. AASLD-IDSA recommends antibody testing with reflex RNA PCR for initial testing, and defines SVR12 as undetectable or nonquantifiable HCV RNA 12 or more weeks after treatment; SVR4 is an alternative in people without cirrhosis or prior direct-acting antiviral exposure. 'Not detected' and 'detected, below the lower limit of quantification' are different results. Some labs also report copies/mL, but the conversion depends on the assay, so this catalog does not convert it. Genotyping is a separate test; Mayo's combined test (HCVQG) runs genotype only when RNA is 500 IU/mL or higher. Viral load is not a measure of fibrosis.

LOINC 11011-4 (primary), 38180-6, 20416-4, 47252-2. Specimen: serum-or-plasma.

Sources

  1. Hepatitis C Virus (HCV) RNA Detection and Quantification by Real-Time Reverse Transcription-PCR, Serum (test HCVQN), Mayo Clinic Laboratories
  2. Hepatitis C Virus (HCV) RNA Quantification with Reflex to HCV Genotype, Serum (test HCVQG), Mayo Clinic Laboratories
  3. Clinical Screening and Diagnosis for Hepatitis C, CDC
  4. Clinical Overview of Hepatitis C, CDC
  5. HCV Testing and Linkage to Care, AASLD-IDSA HCV Guidance (2024)
  6. Monitoring Patients Who Are Starting HCV Treatment, Are on Treatment, or Have Completed Therapy, AASLD-IDSA HCV Guidance (2023)

AI-verified against cited sources. Awaiting expert review. Last reviewed 2026-10-03. How we build and check these pages.

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