HCV Risk Estimator
Before you begin:
Are you currently experiencing symptoms or have you recently been in contact with someone who tested positive?
This tool estimates risk based on demographic and lifestyle factors for people without known symptoms or exposure. It is not designed to assess the likelihood of infection after a specific exposure or to evaluate active symptoms.
If you have symptoms or known exposure, lab testing is the appropriate next step. A healthcare provider can order the right tests and interpret the results for your situation.
Hepatitis C virus (HCV) is a blood-borne infection that can cause chronic liver disease, cirrhosis, and liver cancer. Many people with HCV are unaware of their infection because symptoms may not appear for decades. An estimated 2.4 million people in the US are living with HCV.
This calculator uses a gradient-boosted classifier trained on individual-level serology results from the CDC's NHANES, spanning 2005–2016 with approximately 44,000 participants. The strongest predictor is injection drug use, which accounts for the majority of US HCV transmissions. Being born between 1945–1965 (the "baby boomer" cohort) is also a significant risk factor.
Your percentage represents the estimated probability that a person with your profile has HCV antibodies. The red line on the gauge shows the US population average (~1.5%). A positive HCV antibody result indicates past or current infection but does not distinguish between active and cleared infections. Only an HCV RNA test can determine if the virus is currently active.
This calculator estimates the probability that you have HCV antibodies based on your demographic profile, using patterns from NHANES serology data. It does not test for the virus or provide a diagnosis. Only a blood test can confirm HCV status.
The CDC recommends HCV screening for all adults aged 18 and older at least once, all pregnant women during each pregnancy, and anyone with ongoing risk factors such as injection drug use. People born between 1945–1965 (the baby boomer cohort) are at elevated risk and should be screened if they haven't been already. You can order a Hepatitis C test online through STDCheck.com.
Screening begins with an HCV antibody test (anti-HCV). A positive antibody result is followed by an HCV RNA (viral load) test to determine if the infection is currently active. Antibodies can persist even after the virus has been cleared naturally or through treatment, so the RNA test is essential for confirming active infection.
Yes. Modern direct-acting antiviral (DAA) medications cure HCV in over 95% of cases, typically with 8–12 weeks of oral treatment. Early detection through screening allows treatment before liver damage occurs. This is why the CDC recommends universal adult screening.
HCV is primarily transmitted through blood-to-blood contact. The most common route in the US is sharing needles or other equipment for injecting drugs. Less common routes include needlestick injuries in healthcare settings, receiving blood transfusions before 1992, and perinatal transmission from mother to child. Sexual transmission is possible but uncommon.
People born between 1945–1965 have a significantly higher HCV prevalence than the general population. This is partly because blood transfusions were not screened for HCV until 1992, and injection drug use was more prevalent in this cohort during the 1960s–1980s. Many in this group were infected decades ago and remain undiagnosed.
Yes. Most people with chronic HCV have no symptoms for years or even decades. When symptoms do appear, they often indicate advanced liver damage. This is why screening is important — HCV can be detected and cured long before symptoms develop.
See a healthcare provider if you have ever injected drugs, received a blood transfusion before 1992, have unexplained liver problems, are in the baby boomer cohort and haven't been screened, or have any other HCV risk factors. A simple blood test can confirm your status — STDCheck.com offers confidential HCV testing with results in 1-2 days. This calculator is for education only.
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