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Updated: Jan 28, 2026

A Protocol for Analyzing Hepatitis C Virus Replication
Published on: June 26, 2014
Reliable resolution of ambiguous hepatitis C virus genotype 1 results with the Abbott HCV Genotype Plus RUO assay
V Saludes1,2,3, A Antuori1, B Reinhardt4
1Microbiology Department, Laboratori Clínic Metropolitana Nord, Hospital Universitari Germans Trias i Pujol; Genetics and Microbiology Department, Universitat Autònoma de Barcelona, Badalona, Spain.
Insights
Accurate hepatitis C virus genotype 1 (HCV-1) subtyping is crucial. The Abbott HCV Genotype Plus (GT Plus) assay effectively resolved ambiguous results, improving overall subtyping accuracy in clinical samples.
Area of Science:
- Virology
- Clinical Diagnostics
- Molecular Biology
Background:
- Accurate subtyping of hepatitis C virus genotype 1 (HCV-1) is essential for clinical and epidemiological purposes.
- Existing methods can yield ambiguous results, necessitating improved diagnostic approaches.
Purpose of the Study:
- To evaluate the Abbott HCV Genotype Plus (GT Plus) assay as a reflex test for resolving ambiguous HCV-1 subtypes.
- To assess the reliability and efficiency of the GT Plus assay in a clinical setting.
Main Methods:
- The GT Plus assay was tested on 198 HCV-1 specimens, including those with ambiguous results from the Abbott RealTime Genotype II (GT II) assay.
- Sanger sequencing and comparison with LiPA 2.0 were used for validation.
- Performance was evaluated based on successful subtyping rates and concordance with reference methods.
Main Results:
- The GT Plus assay successfully assigned subtypes in 88.8% (142/160) of previously un-subtyped samples.
- Overall subtyping concordance between GT Plus and reference methods (sequencing or LiPA 2.0) was high at 98.6% (140/142).
- The combined use of GT II and GT Plus assays reduced ambiguous HCV-1 results, achieving 98.9% successful subtyping.
Conclusions:
- The combined use of Abbott GT II and GT Plus assays provides a reliable and simple strategy to significantly reduce ambiguous HCV-1 results.
- This approach enhances the overall efficiency and accuracy of HCV-1 subtyping in clinical diagnostics.
Abstract:
Accurate subtyping of hepatitis C virus genotype 1 (HCV-1) remains clinically and epidemiologically relevant. The Abbott HCV Genotype Plus RUO (GT Plus) assay, targeting the core region, was evaluated as a reflex test to resolve ambiguous HCV-1 results in a challenging sample collection. 198 HCV-1 specimens were analysed with GT Plus (38 specimens with and 160 without subtype assigned by the Abbott RealTime Genotype II (GT II) assay targeting the 5'NC and NS5B regions). Sanger sequencing of the core and/or NS5B regions were performed in 127 specimens without subtype assignment by GT II, with "not detected" results by GT Plus, or with mixed genotypes/subtypes. The remaining GT Plus results were compared to LiPA 2.0 (n = 45) or just to GT II results if concordant (n = 26). GT Plus successfully assigned the subtype in 142/160 (88.8%) samples. "Not detected" results indicated other HCV-1 subtypes/genotypes or mismatches in the core region in subtype 1b. The subtyping concordance between GT Plus and either sequencing or LiPA was 98.6% (140/142). Therefore, combined use of GT II and GT Plus assays represents a reliable and simple approach which considerably reduced the number of ambiguous HCV-1 results and enabled a successful subtyping of 98.9% of all HCV-1 samples.
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