CD4 cells are the most important cells in the immune system. A type of test called a CD4 count tells you how many CD4 cells there are in a small sample of blood. The more there are the better. Decisions about when to start treatment are often based on the CD4 count.

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CD4 count resources

  • Health issues

    If you are ‘HIV positive’ this means that you have a virus called HIV in your body. It doesn’t mean that you are ill, or that...

    From: Booklets

    Information level Level 2
  • CD4 cell counts

    T-cells (or T-lymphocytes) are white blood cells that play important roles in the immune system. There are two main types of T-cells. One type has...

    From: Factsheets

    Information level Level 2
  • CD4 cell counts

    CD4 cells, sometimes also called T-cells, or T-helper cells, are white blood cells which organise the immune system’s response to bacterial, fungal and viral infections. ...

    From: Living with HIV

    Information level Level 2
  • CD4 cell counts

    CD4 cells (sometimes called T-cells, or helper cells) are white blood cells that organise your immune system’s response to infections. Your CD4 cell count is the measurement of...

    From: Booklets

    Information level Level 2
  • CD4 and viral load

    It’s important for all people with HIV to take regular blood tests. The two most important blood tests are for CD4 and viral load.A CD4...

    From: The basics

    Information level Level 1
  • Health checks

    Staff at your HIV clinic use various tests to keep an eye on your HIV. Many of these tests are done on samples of your...

    From: The basics

    Information level Level 1
  • Diagnosed with HIV at a low CD4 count

    NAM's factsheet on being diagnosed with HIV when already at a low CD4 cell count...

    From: Factsheets

    Information level Level 2
  • CD4 cell count

    Details on the CD4 count, including how it is used to predict prognosis and guide treatment decisions....

    From: HIV treatments directory

    Information level Level 4

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