Immunology

CD8 Percentage

Normal Range
15 - 40%
Sample Type
Standard
Fasting
No
Unit
%

CD8 Percentage measures the proportion of T-lymphocytes that are 'cytotoxic' or 'suppressor' cells. These cells are responsible for killing virally infected and tumor cells. In an immunology panel, the CD8 percentage is used to monitor immune system competence, particularly in patients with HIV/AIDS, or to evaluate the CD4/CD8 ratio, which is an indicator of immune exhaustion or chronic inflammation.

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Interactive
%

Enter your lab result to see where you stand compared to the standard reference range.

Why Context Matters

Isolated CD8 percentages can be misleading. They must be interpreted in the context of the Absolute CD8 Count and the Total Lymphocyte Count. Transient elevations can occur due to any recent viral infection (like EBV or CMV), which might not indicate a chronic immune disorder.

Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.

Clinical References

Source-of-truth databases and clinical guidelines for CD8 Percentage:

Research & Guidelines

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DR

Medically Reviewed by Dr. Binoy Babu, MBBS

Board Certified Doctor • 10+ Years Clinical Experience

Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.

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