[Laboratory diagnosis of hepatitis C]

Area of Science:

• Clinical Virology
• Diagnostic Laboratory Medicine
• Immunology

Context:

• Hepatitis C Virus (HCV) infection diagnosis relies on serological assays and molecular methods.
• Accurate and timely diagnosis is crucial for patient management and public health.
• Existing diagnostic protocols may require refinement for improved sensitivity and specificity.

Purpose:

• To present a comprehensive laboratory algorithm for diagnosing Hepatitis C Virus (HCV) infection.
• To define the diagnostic significance of different laboratory tests, including Enzyme Immunoassays (EIA) and Polymerase Chain Reaction (PCR).
• To establish protocols for managing equivocal results and high-risk populations.

Summary:

• The proposed algorithm integrates third-generation EIA for anti-HCV screening with HCV RNA PCR.
• A positive PCR result is considered diagnostically significant.
• For positive EIA and negative PCR results, immunoblotting is recommended; otherwise, diagnosis relies on probability values derived from optical density (OD) readings.
• Patients with doubtful results undergo regular follow-up with repeated PCR and immunoblotting every three months for one year.
• Integrated laboratory diagnosis using biochemical, serological, and PCR methods is advised for high-risk groups.

Impact:

• Enhances the accuracy and reliability of Hepatitis C Virus (HCV) diagnosis.
• Provides a clear diagnostic pathway, reducing uncertainty in clinical decision-making.
• Facilitates early detection and management of HCV infections, particularly in high-risk populations.