Hepatitis C does not show up on routine blood tests. Standard panels like a complete blood count (CBC) and comprehensive metabolic panel (CMP) do not include hepatitis C screening. To find out if you have hepatitis C, you need a separate, specific blood test that your doctor must order individually.
What Routine Blood Tests Actually Check
When you go in for a physical and get “routine bloodwork,” your doctor typically orders a CBC and a CMP. A CBC measures your red and white blood cells along with platelets. A CMP checks your blood sugar, kidney function, electrolytes, and a handful of liver-related markers. Neither panel looks for the hepatitis C virus itself or for antibodies your body produces in response to it.
This distinction matters because roughly 40% of Americans living with hepatitis C, an estimated 840,000 people, don’t know they’re infected. Most acute infections cause no symptoms at all, which means there’s often no obvious reason for a doctor to suspect the virus. Without a targeted test, the infection can go undetected for years or even decades.
How Liver Enzymes Can Hint at a Problem
Your CMP does include two liver enzymes: AST and ALT. These aren’t hepatitis C tests, but elevated levels can act as a red flag. When either enzyme rises above 40 or 50, or exceeds twice the upper limit of normal, clinical guidelines recommend further investigation. One of the first follow-up tests on that list is a hepatitis C antibody screen.
Here’s the catch: not everyone with hepatitis C has noticeably elevated liver enzymes, especially early on. And elevated enzymes can come from many other causes, including alcohol use, fatty liver disease, and certain medications. So normal liver enzymes on a routine panel don’t rule out hepatitis C, and abnormal ones don’t confirm it. They’re a clue, not an answer.
The Two-Step Hepatitis C Test
Confirming hepatitis C requires its own dedicated testing process, and it happens in two stages.
The first step is an HCV antibody test (sometimes called an anti-HCV test). This blood draw looks for antibodies your immune system produces after exposure to the virus. A positive result means you’ve been infected at some point, but it doesn’t tell you whether the virus is still active. People who cleared the infection naturally or were cured through treatment will still test positive for antibodies for the rest of their lives.
If your antibody test comes back positive, your doctor orders a second test: a nucleic acid test (NAT) for HCV RNA, also called a PCR test. This one looks for the virus’s genetic material in your blood.
- Negative RNA result: You were infected at some point but no longer carry the virus. You either cleared it on your own or were successfully treated.
- Positive RNA result: The virus is currently active in your body and you need treatment.
One important timing note: if you think you were exposed to hepatitis C within the past six months, your doctor should skip the antibody test and go straight to the RNA test. Antibodies can take weeks to develop after exposure, so the antibody test may miss a very recent infection.
Who Should Get Tested
The CDC recommends that all adults aged 18 and older get screened for hepatitis C at least once in their lifetime. Pregnant women should be screened during each pregnancy. These are universal recommendations, meaning they apply regardless of whether you have symptoms or known risk factors.
Despite these guidelines, many doctors still don’t include hepatitis C screening as part of a standard physical unless a patient asks for it or has an obvious risk factor. The gap between what’s recommended and what routinely happens in a doctor’s office is a major reason so many infections remain undiagnosed.
How to Get Tested
You can simply ask your doctor to add an HCV antibody test to your next blood draw. The CDC explicitly states that any person who requests hepatitis C testing should receive it. You don’t need to explain why or disclose risk factors.
Cost shouldn’t be a barrier. Under the Affordable Care Act, all marketplace health plans must cover hepatitis C screening as a preventive service with no deductible or copay. This applies to hepatitis B and C testing as well as hepatitis A and B vaccination.
If you’ve never been screened and you’re over 18, asking for the test during your next visit takes one sentence and could catch an infection you’d otherwise never know about. Given that nearly half of people with hepatitis C have no symptoms, the only reliable way to know your status is to test for it directly.