Understanding Viral Load Assays for Cytomegalovirus and Epstein-Barr Virus

Crucial Questions

March 2010

Quantitative viral load assays can provide information to help make these difficult treatment decisions. Common questions regarding these tests include:

• What is the threshold between insignificant viral replication and risk for disease?
• What is the interval of change that is significant?

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Crucial Questions

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Jump to section:

• Introduction
• Cytomegalovirus and Epstein-Barr Virus Background
• Patients and Immunosuppression
• CMV in Transplant Patients
• When to Treat CMV?
• CMV Treatment Strategies
• EBV and Posttransplantation Lymphoproliferative Disorder
• When to Treat EBV?
• Treatment for EBV Infection or PTLD
• The Balancing Act of Transplant Immunology
• The Balancing Act of Transplant Immunology: Less immunosuppression
• The Balancing Act of Transplant Immunology: More immunosuppression
• The Balancing Act of Transplant Immunology
• Crucial Questions
• Viral Load Assays
• Viral Load Assays, cont.
• Variability
• Ideal Standards
• Comparing Results
• Logarithmic (log) Processes
• Advantages of Logarithmic (log) Numbers
• Integer, Scientific Notation, Logarithm
• Log vs Fold
• Disadvantages of Log
• Remember These?
• System Precision/Imprecision
• What is Significant Change?
• Reality Check
• Literature is Helpful But...
• Interpreting Viral Loads
• Review
• References
• Questions?