Overview
Blood-borne virus laboratory pathways for HIV, HBV, and HCV generate staged diagnostic evidence through screening immunoassays, supplemental/confirmatory testing, and nucleic-acid assays as ordered, without treatment selection or dosing.
Classification
| Pathway | Screen evidence | Supplemental evidence (hedged) |
|---|---|---|
| HIV | Ag/Ab combination IA (common) | Ab differentiation ± RNA per local algorithm |
| HBV | HBsAg (± panel markers) | Confirm HBsAg per SOP; pattern with anti-HBc/anti-HBs |
| HCV | Anti-HCV IA | HCV RNA for viremia assessment when indicated |
Morphologic Features
No morphology. Interpret immunoassay indices/reactivity flags and NAAT qualitative or quantitative results against assay IFU and institutional report rules.
Laboratory Characteristics
- Repeat/reactive rules per package insert & SOP
- Confirmation holds before final wording
- Separate prelim vs confirmed report states
- Confidentiality and notification pathways (local)
Reference Intervals
Serology cutoffs, signal-to-cutoff ratios, confirmation algorithms, and quantitative HBV/HCV/HIV viral-load interpretive frameworks are assay- and institution-specific (and may follow adopted public-health algorithms). Verify current SOP, do not treat any single cascade as universal.
Clinical and Laboratory Significance
Pathway completion determines whether results support screening reactivity only, confirmed infection status language, immune/vaccine pattern framing, or viremia detection, each is a distinct laboratory claim.
Differential Considerations
Differentiate true infection evidence from false-reactive screens, window-period negatives, vaccine-type anti-HBs patterns, resolved HCV Ab+/RNA− patterns, and incomplete panels awaiting supplemental tests.
Comparison Tables
Pathway stage cues
| Finding | Laboratory meaning | Do not claim |
|---|---|---|
| HIV Ag/Ab repeatedly reactive | Screen reactivity established | Final infection + drug regimen |
| HBsAg+ / anti-HBc+ / anti-HBs− | Infection-pattern framework (refine with ordered markers) | Therapy choice from serology alone |
| HCV Ab+ / RNA pending | Exposure serology; viremia unknown | Current infection proven by Ab alone |
| HCV Ab+ / RNA not detected | No detectable viremia at sampling (assay limits) | Automatic “never infected” or treatment advice |
Classification Frameworks
Not applicable.
Laboratory Notes
- Hedge confirmation algorithms and kit generations as local
- Use approved comments only for reactive screens
- Never include antiretroviral or hepatitis antiviral dosing
References
Authoritative textbooks, guidelines, and reviews supporting this reference entry. Verify reference intervals, critical limits, and reflex criteria against institutional protocols and current guideline editions.
Textbooks
- Forbes BA, Sahm DF, Weissfeld AS. Bailey & Scott's Diagnostic Microbiology. 15th ed. Elsevier; 2020.
- Mahon CR, Lehman DC, Manuselis G. Textbook of Diagnostic Microbiology. 6th ed. Elsevier; 2018.
- Carroll KC, Hobden JA, Miller S, et al. Jawetz, Melnick, & Adelberg's Medical Microbiology. 28th ed. McGraw-Hill; 2019.
- Murray PR, Rosenthal KS, Pfaller MA. Medical Microbiology. 9th ed. Elsevier; 2021.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Performance Standards for Antimicrobial Susceptibility Testing. CLSI document M100 (verify current edition and institutional adoption).
- Centers for Disease Control and Prevention / NIH. Biosafety in Microbiological and Biomedical Laboratories (BMBL). Current edition (verify institutional adoption).
Frequently Asked Questions
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