Optimal Result:
12 - 42 %.
The proportion of all T cells that are CD8 cells.
CD8 cells are also called cytotoxic T-lymphocytes. They help fight cancer and germs that live inside your cells (intracellular pathogens).
The CD8 percentage is sometimes more reliable than the absolute count of CD8 because it tends to vary less.
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What does it mean if your % CD8 result is too high?
An elevated percentage of CD8 in a Lymphocyte Panel often signifies an increase in cytotoxic T cells, which are a type of immune cell that plays a crucial role in destroying cells infected with viruses, as well as cancer cells. This elevation can be indicative of various conditions, including viral infections such as HIV, as well as other chronic infections and autoimmune diseases. Monitoring CD8 levels can aid in the assessment of immune system function and response to treatment.
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What does it mean if your % CD8 result is too low?
A decrease in the percentage of CD8+ T cells could have various clinical implications depending on the context. CD8+ T cells are a type of lymphocyte that play a crucial role in the immune system, particularly in the control of viral infections and in tumor surveillance.
Here are some potential implications of a decreased percentage of CD8+ T cells:
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Immunodeficiency: A lower percentage of CD8+ cells might indicate an impaired immune response, particularly if the total lymphocyte count is also low. This can be seen in conditions like HIV infection, where the virus specifically targets CD4+ T cells but also leads to an overall decline in T cell function and numbers.
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Chronic Infection or Cancer: Persistent infections or cancer can exhaust the immune system, leading to a decrease in the effectiveness and possibly the percentage of CD8+ T cells.
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Immune Suppression: Certain therapies, such as immunosuppressive drugs used in transplant patients or patients with autoimmune diseases, can deliberately reduce the activity and numbers of CD8+ T cells to prevent organ rejection or reduce autoimmune activity.
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Age-related Changes: Aging can naturally lead to changes in the immune system, including decreases in the proportion of various types of T cells.
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Secondary to Other Diseases: Conditions like lymphoma or other hematological diseases can alter the proportions of lymphocyte subsets due to the disease process itself or as a result of treatment.
Interpreting these changes typically requires considering the entire clinical context, including symptoms, other lab results, and known medical conditions. Consulting with a healthcare provider is essential for a proper interpretation and to determine if further investigation or treatment is necessary.
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