New Rapid Test for Hepatitis B Offers Hope for Faster Diagnosis and Treatment

A new point-of-care test can detect hepatitis B virus (HBV) in under an hour, offering a significant advancement in diagnosing and managing the chronic infection. The Xpert HBV Viral Load test, utilizing a fingerstick blood sample, demonstrates accuracy comparable to traditional, more time-consuming laboratory tests.

The Global Burden of Hepatitis B

The World Health Organization (WHO) has set ambitious goals to eliminate HBV as a public health threat by 2030. These goals include diagnosing 90% of individuals living with chronic HBV and ensuring 80% of those eligible receive antiviral therapy.^{https://www.who.int/news-room/fact-sheets/detail/hepatitis-b} However, progress is slow. In 2022, only 14% of the estimated 260 million people living with chronic HBV had been diagnosed, and just 8% of those eligible were on treatment.^{https://www.who.int/news-room/fact-sheets/detail/hepatitis-b}

Challenges with Current HBV DNA Testing

Suboptimal HBV DNA testing is a major obstacle in the HBV care pathway, as recognized by the WHO.^{https://pmc.ncbi.nlm.nih.gov/articles/PMC7917951/} Traditional testing requires blood collection, plasma preparation, and centralized laboratory processing, often involving multiple visits and delaying treatment initiation.

How the Xpert HBV Viral Load Test Works

The Xpert HBV Viral Load test utilizes reverse transcriptase polymerase chain reaction (RT-PCR) to measure HBV viral load within 60 minutes.^{https://www.cepheid.com/en-LU/tests/blood-virology-womens-health-sexual-health/xpert-hbv-viral-load.html} A recent study involving 246 participants with chronic HBV infection demonstrated the test’s effectiveness:

• It correctly identified 97% of patients with HBV DNA levels greater than 100 international units (IU/mL).
• It accurately identified 90.3% of those with HBV DNA levels of 100 IU/mL or less.
• The test correctly identified 95.3% of patients with HBV DNA levels above 2,000 IU/mL.
• It distinguished 95% of those without high HBV concentrations.

Potential Impact and Future Directions

Researchers emphasize the excellent performance of the point-of-care Xpert HBV DNA test using fingerstick capillary samples. They advocate for the development of a dedicated Xpert HBV DNA fingerstick test to facilitate decentralized care.^{https://pmc.ncbi.nlm.nih.gov/articles/PMC7917951/}

This approach could significantly benefit individuals in low- and middle-income countries with limited resources, those in remote areas, and hard-to-reach populations, including pregnant women with HBV.^{https://pmc.ncbi.nlm.nih.gov/articles/PMC7917951/}

Further research is needed to assess the test’s performance across different HBV genotypes and at very high viral loads. Reproducibility of the point-of-care test also requires evaluation.

Key Takeaways

• A new rapid test, Xpert HBV Viral Load, can detect HBV in under an hour using a fingerstick blood sample.
• The test demonstrates accuracy comparable to traditional laboratory methods.
• Widespread adoption of this test could significantly improve HBV diagnosis and treatment rates, particularly in resource-limited settings.
• Further research is needed to evaluate the test’s performance across all HBV genotypes and viral load ranges.