Rapid HCV Test Accuracy: Reducing False Positives
Faster Hepatitis C Testing: Balancing Speed adn Accuracy for Better Public Health Outcomes
Table of Contents
A recent study suggests that adjusting the reading time for rapid Hepatitis C virus (HCV) antibody tests could considerably improve efficiency in large-scale screening programs, notably for vulnerable populations. While a faster result might miss some active infections, a proposed dual-read approach could streamline diagnosis, reduce unnecessary follow-up testing, and enhance patient engagement.
The Trade-off: Speed vs. Missed Diagnoses
The OraQuick HCV antibody test, a widely used rapid diagnostic tool, typically requires a 20-minute waiting period for results. Though, research published in the Journal of Viral Hepatitis explored the impact of reading the test at just five minutes. Investigators found that this accelerated approach could reduce unnecessary RNA testing by 13% but at the cost of missing 2.5% of viremic individuals.”Using a five-minute result to trigger RNA testing would have reduced unnecessary RNA testing by 13% in our cohort at the cost of missing 2.5% of viremic individuals,” the researchers reported.This highlights a critical balance between efficiency and diagnostic accuracy,a balance that may need to be adjusted based on specific public health contexts and the populations being served.
Enhancing Engagement in High-Risk Groups
The study’s authors emphasize that the utility of an HCV testing approach extends beyond mere predictive accuracy, especially in populations facing complex health needs and challenges with retaining them in care. for individuals who inject drugs, a group ofen experiencing concurrent health issues and negative past healthcare experiences, the speed and visibility of a five-minute rapid antibody test administered at the point of care can be a significant advantage.
“People who inject drugs often face concurrent health issues and negative past healthcare experiences.Five-minute rapid antibody testing administered by nurses at the point of care provides prompt, visible results and expedites reflexive RNA testing, which may increase engagement,” the researchers argue. This promptness can foster trust and encourage individuals to remain engaged in the testing and treatment cascade.
A Proposed Dual-Read Strategy for streamlined Screening
To leverage the benefits of faster results while mitigating the risk of missed diagnoses, the investigators propose a novel dual-read approach. This strategy involves using the five-minute result to immediately trigger confirmatory RNA testing for those with a positive antibody test. Results that are only positive at the 20-minute mark would then be interpreted as indicative of past, resolved infections.
“This dual approach could streamline diagnosis, increase throughput in large screening programs, and lower costs through reducing unnecessary RNA testing for non-viremic individuals,” they suggest. This method aims to optimize resources by focusing confirmatory testing on individuals most likely to have active infections, while still acknowledging the possibility of past exposure.
What You Need to Know
Reading the OraQuick HCV antibody test at 5 minutes rather of the recommended 20 minutes reduced false positives by 13%, but missed 2.5% of viremic cases, potentially delaying needed treatment for some individuals.
Shortening the wait time for results may enhance acceptability and engagement in test-and-treat programs, especially among people who inject drugs, who may face barriers like distrust of healthcare systems or unstable access to care.
The authors propose a dual-read approach: use the 5-minute result to trigger RNA testing and interpret 20-minute-only positives as past (resolved) infections. This could streamline large-scale HCV screening while reducing unnecessary follow-up testing and costs.
Context-Sensitive Rapid Testing and Future Research
The study’s findings underscore the need for “context-sensitive rapid-testing,” particularly when working with marginalized groups. The researchers advocate for further research into screening strategies that can effectively account for previously resolved infections, a common occurrence in populations with a history of exposure.
By adapting testing protocols to the specific needs and challenges of different populations, public health initiatives can become more efficient, effective, and ultimately, more successful in controlling the spread of Hepatitis C.
References
- Heath K, Guzman R, Elsum I, et al. Balancing efficiency and accuracy in Hepatitis C rapid antibody testing: Insights from a cluster randomised crossover trial. J Viral Hepat*. 2025; 32:e70043. doi.org/10.1111/vh.70043.
- K. Heath, J. S. Doyle, I. Elsum, et al., Same-Visit Hepatitis C Testing and Treatment to Accelerate Cure Among People Who Inject drugs (The QuickStart Study): A Cluster randomised cross-over trial protocol.