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Filters Content type: News, About HIV Topic: CD4 count

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.

The stages of HIV infection

About HIV
February 2020

CD4/CD8 ratio

About HIV
July 2019

CD4 cell counts

About HIV
May 2017