Hepatitis C Case Study: Lab Interpretation for New Grad NPs

Hepatitis C labs can be confusing when you're first learning them—especially when you're trying to remember what the HCV antibody tells you, when to order HCV RNA, and what to do when one of those results comes back positive.

In this episode, I walk through a patient case to show you how I approach hepatitis C testing and interpretation in primary care, including who to screen, the difference between HCV antibody and HCV RNA, how to interpret different combinations of results, and what the PCP's role is when a patient has current hepatitis C infection.

2026 Update: The basic approach to interpreting HCV antibody and HCV RNA in this episode is still useful, but hepatitis C screening and treatment have changed significantly since it was recorded. Current guidance recommends universal adult screening, screening during each pregnancy, reflex HCV RNA testing after a reactive antibody, and treatment of essentially all patients with current HCV infection. Simplified pangenotypic treatment also means that many treatment-naïve adults can now be treated without routine genotype testing or automatic referral to GI/hepatology. See the Clinical Updates below for the specific changes.

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What I Cover in This Episode

  • A patient case involving hepatitis C risk factors and a positive HCV antibody

  • Who was recommended for hepatitis C screening at the time of recording

  • The difference between HCV antibody and HCV RNA

  • How the timing of a recent exposure affects which test you order

  • How to approach a patient with detectable HCV RNA, including fibrosis assessment and pretreatment evaluation

  • The PCP's role in counseling, harm reduction, vaccination, monitoring, and caring for patients with hepatitis C

Clinical Updates as of 2026

  • Hepatitis C screening is now much broader. Current CDC guidance recommends one-time HCV screening for all adults age 18 and older and during each pregnancy, with periodic testing for people with ongoing risk. The episode instead discusses the older 1945–1965 birth-cohort and risk-based screening recommendations.

  • Start with HCV antibody with reflex HCV RNA for routine screening. A reactive HCV antibody tells you that the patient has been exposed to HCV at some point; detectable HCV RNA establishes current infection. Reflex RNA testing helps avoid losing patients between the initial antibody result and confirmation of active infection.

  • Correction: You don't need to wait six months to check an HCV antibody after a recent exposure. In the episode, I say that you can't check the antibody until about six months after exposure. HCV RNA can generally become detectable approximately 1–2 weeks after exposure, while HCV antibody is usually detectable approximately 8–11 weeks after exposure. When acute infection or recent exposure is suspected, check HCV antibody and HCV RNA.

  • Don't wait for spontaneous clearance before treating confirmed acute HCV. In the episode, I discuss monitoring for approximately six months to see whether the infection clears before treatment. Current AASLD/IDSA guidance recommends a test-and-treat approach: initiate treatment after acute HCV with quantifiable RNA is diagnosed rather than waiting for spontaneous resolution.

  • Active or recent injection drug use is not a reason to withhold HCV treatment. The episode suggests that patients at risk for reinfection may not be treated until they are more confident in their sobriety. Current guidance specifically states that active or recent drug use or concern for reinfection is not a contraindication to treatment. Offer HCV treatment alongside harm-reduction services and treatment for substance use disorder when appropriate.

  • Many patients no longer require routine genotype testing or automatic GI referral. Pangenotypic direct-acting antiviral regimens and simplified treatment pathways allow many treatment-naïve adults to be evaluated and treated without routine genotype testing. Primary care clinicians with appropriate HCV knowledge can provide treatment; specialty consultation or referral is appropriate when patients don't meet simplified treatment criteria or have more complex liver disease or treatment histories.

Key Takeaways as of 2026

  • A positive HCV antibody does not mean the patient currently has hepatitis C. Confirm current infection with HCV RNA. The antibody generally remains positive after spontaneous clearance or successful treatment and does not indicate immunity.

  • Think about timing when recent exposure is possible. A negative antibody early after exposure doesn't exclude infection; HCV RNA becomes detectable earlier.

  • A detectable HCV RNA should lead to evaluation and treatment—not months of waiting to establish chronic infection. Assess fibrosis, relevant labs and comorbidities, HBV/HIV status, medications and drug interactions, and whether the patient qualifies for a simplified treatment pathway.

  • Don't make sobriety a prerequisite for treatment. Patients with ongoing substance use can be successfully treated for hepatitis C and should also be offered harm-reduction resources and treatment for substance use disorder when appropriate.

  • Confirm cure after treatment. Check HCV RNA at least 12 weeks after treatment is completed. Patients without cirrhosis who achieve sustained virologic response generally don't need routine liver-related follow-up, while patients with cirrhosis still require ongoing surveillance, including HCC surveillance every six months.

  • For ongoing exposure risk, screen for reinfection with HCV RNA—not another antibody. Once the antibody is positive, it generally remains positive.

Want to Build More Confidence Interpreting Labs?

If you found this case study helpful, you'll probably enjoy the Lab Interpretation Series.

Inside the series, we take the same practical, case-based approach to interpreting common primary care labs—but go much deeper into the clinical reasoning behind them. Rather than memorizing reference ranges, you'll learn how to recognize patterns, work through differential diagnoses, and apply lab results to real patient care.

The Lab Interpretation Series includes self-paced, ANCC-accredited courses covering CBC, basic metabolic panel, renal labs, liver function tests, thyroid labs, hyperlipidemia, and more. Learn more about the Lab Interpretation Series.

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