CD4 refers to a type of white blood cell known as CD4+ T helper cells, which play a vital role in the human immune system. These cells are essential for coordinating the immune response, as they stimulate other immune cells, including macrophages, to respond to pathogens.

The term "CD4" is commonly associated with a laboratory test known as the CD4 lymphocyte count. This test measures the number of CD4 cells in the blood and is primarily used to assess the immune system function in individuals living with HIV. A healthy CD4 count typically ranges from 500 to 1500 cells/mm³, and lower counts can indicate a weakened immune system, which has significant implications for health, particularly concerning HIV and AIDS management.

For further details, you can explore the following resources:

1. MedlinePlus provides an overview of the CD4 count and its significance in measuring immune system function in people with HIV. Learn more here.

2. WebMD discusses how CD4 count helps doctors assess and manage treatment for HIV and AIDS. Read more about it here.

3. The Wikipedia entry on CD4 explains its role as a type of T helper cell and its importance in the immune response. Check it out here.

4. Beckman Coulter elaborates on the CD4 protein found on T helper cells and its critical function in the immune system. Find more information here.

5. Aidsmap provides details on the role of CD4 cells in the immune system and discusses what CD4 cell counts indicate regarding health status. Read more about CD4 cell counts here.

6. The NIH Clinical Info site describes the function of CD4 T lymphocytes in the immune response. Learn more at this link.

7. For a more in-depth medical perspective, StatPearls offers detailed information about CD4 cell counts and their implications for HIV health management. Explore this resource here.

Overall, understanding CD4 and its implications for health is crucial, especially for individuals living with HIV/AIDS.

Sources

CD4 Lymphocyte Count: MedlinePlus Medical TestCD4 Count, HIV, and AIDS: Test and Results and What They MeanCD4 - WikipediaWhat is CD4 - Beckman CoulterCD4 cell counts - AidsmapCD4 T Lymphocyte | NIH - Clinical Info HIV.govCD4 Cell Count and HIV - StatPearls - NCBI Bookshelf

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